diff --git a/_unittest/conftest.py b/_unittest/conftest.py
index afbf23fabd4..0c1994057fb 100644
--- a/_unittest/conftest.py
+++ b/_unittest/conftest.py
@@ -27,6 +27,7 @@
 import tempfile
 import time
 
+import matplotlib
 import pytest
 
 from pyaedt.generic.settings import settings
@@ -219,3 +220,9 @@ def _method(project_name=None, subfolder=""):
         )
 
     return _method
+
+
+@pytest.fixture(autouse=True)
+def matplotlib_use_agg():
+    """Configure Matplotlib to use 'Agg' backend for all tests."""
+    matplotlib.use("Agg")
diff --git a/_unittest/test_02_2D_modeler.py b/_unittest/test_02_2D_modeler.py
index f4985110b52..bfdc97894f0 100644
--- a/_unittest/test_02_2D_modeler.py
+++ b/_unittest/test_02_2D_modeler.py
@@ -167,15 +167,14 @@ def test_09_plot(self):
             position=[0, 0, 0], start_point=[0, 0, 2], num_sides=3, name="MyPolygon", material="Copper"
         )
         obj = self.aedtapp.plot(
-            show=False,
             export_path=os.path.join(self.local_scratch.path, "image.jpg"),
             show_bounding=True,
             show_grid=True,
         )
         assert os.path.exists(obj.image_file)
-        obj2 = self.aedtapp.plot(show=False, export_path=os.path.join(self.local_scratch.path, "image.jpg"), view="xy")
+        obj2 = self.aedtapp.plot(export_path=os.path.join(self.local_scratch.path, "image.jpg"), view="xy")
         assert os.path.exists(obj2.image_file)
-        obj3 = self.aedtapp.plot(show=False, export_path=os.path.join(self.local_scratch.path, "image.jpg"), view="xy1")
+        obj3 = self.aedtapp.plot(export_path=os.path.join(self.local_scratch.path, "image.jpg"), view="xy1")
         assert filecmp.cmp(obj.image_file, obj3.image_file)
 
     def test_10_edit_menu_commands(self):
diff --git a/_unittest/test_12_1_PostProcessing.py b/_unittest/test_12_1_PostProcessing.py
index addd18ff579..33eb6408a51 100644
--- a/_unittest/test_12_1_PostProcessing.py
+++ b/_unittest/test_12_1_PostProcessing.py
@@ -112,7 +112,6 @@ def test_01_Animate_plt(self):
             intrinsics={"Freq": "5GHz", "Phase": "0deg"},
             variation_variable="Phase",
             variations=phases,
-            show=False,
             export_gif=True,
             export_path=self.local_scratch.path,
         )
@@ -127,7 +126,6 @@ def test_01_Animate_plt(self):
             variations=phases,
             project_path="",
             export_gif=False,
-            show=False,
         )
         model_gif2.gif_file = os.path.join(self.aedtapp.working_directory, "test2.gif")
         model_gif2.camera_position = [0, 50, 200]
@@ -514,7 +512,6 @@ def test_14_Field_Ploton_cutplanedesignname(self):
             image_format="jpg",
             view="xy",
             plot_label=plot1.name + " label",
-            show=False,
         )
         assert os.path.exists(plot_obj.image_file)
         os.unlink(plot_obj.image_file)
@@ -539,7 +536,6 @@ def test_14_Field_Ploton_cutplanedesignname(self):
             image_format="jpg",
             view="xy",
             plot_label=plot1.name + " label",
-            show=False,
             file_format="aedtplt",
         )
         assert os.path.exists(plot_obj.image_file)
@@ -566,7 +562,6 @@ def test_14B_Field_Ploton_Vector(self):
             intrinsics=intrinsic,
             mesh_on_fields=False,
             view="isometric",
-            show=False,
             export_path=self.local_scratch.path,
             image_format="jpg",
         )
@@ -574,12 +569,10 @@ def test_14B_Field_Ploton_Vector(self):
 
     @pytest.mark.skipif(is_linux or sys.version_info < (3, 8), reason="Not running in ironpython")
     def test_15_export_plot(self):
-        obj = self.aedtapp.post.plot_model_obj(
-            show=False, export_path=os.path.join(self.local_scratch.path, "image.jpg")
-        )
+        obj = self.aedtapp.post.plot_model_obj(export_path=os.path.join(self.local_scratch.path, "image.jpg"))
         assert os.path.exists(obj.image_file)
         obj2 = self.aedtapp.post.plot_model_obj(
-            show=False, export_path=os.path.join(self.local_scratch.path, "image2.jpg"), plot_as_separate_objects=False
+            export_path=os.path.join(self.local_scratch.path, "image2.jpg"), plot_as_separate_objects=False
         )
         assert os.path.exists(obj2.image_file)
 
diff --git a/_unittest/test_12_PostProcessing.py b/_unittest/test_12_PostProcessing.py
index 03f2ba5bd0b..647651fb1cf 100644
--- a/_unittest/test_12_PostProcessing.py
+++ b/_unittest/test_12_PostProcessing.py
@@ -417,7 +417,7 @@ def test_55_time_plot(self, sbr_test):
         )
         assert os.path.exists(frames_list)
         sbr_test.post.plot_scene(
-            frames_list, os.path.join(sbr_test.working_directory, "animation.gif"), norm_index=5, dy_rng=35, show=False
+            frames_list, os.path.join(sbr_test.working_directory, "animation.gif"), norm_index=5, dy_rng=35
         )
         assert os.path.exists(os.path.join(sbr_test.working_directory, "animation.gif"))
         sbr_test.post.plot_scene(
@@ -425,7 +425,6 @@ def test_55_time_plot(self, sbr_test):
             os.path.join(sbr_test.working_directory, "animation2.gif"),
             norm_index=5,
             dy_rng=35,
-            show=False,
             convert_fields_in_db=True,
             log_multiplier=20.0,
         )
@@ -616,14 +615,13 @@ def test_70_far_field_data(self):
         ffdata.polar_plot_3d_pyvista(
             quantity="RealizedGain",
             image_path=img4,
-            show=False,
             background=[255, 0, 0],
             show_geometry=False,
             convert_to_db=True,
         )
         assert os.path.exists(img4)
         data_pyvista = ffdata.polar_plot_3d_pyvista(
-            quantity="RealizedGain", show=False, background=[255, 0, 0], show_geometry=False, convert_to_db=True
+            quantity="RealizedGain", background=[255, 0, 0], show_geometry=False, convert_to_db=True
         )
         assert isinstance(data_pyvista, Plotter)
 
@@ -639,7 +637,6 @@ def test_71_antenna_plot(self, field_test):
             title="Contour at {}Hz".format(ffdata.frequency),
             image_path=os.path.join(self.local_scratch.path, "contour.jpg"),
             convert_to_db=True,
-            show=False,
         )
         assert os.path.exists(os.path.join(self.local_scratch.path, "contour.jpg"))
 
@@ -669,13 +666,12 @@ def test_71_antenna_plot(self, field_test):
         ffdata.polar_plot_3d_pyvista(
             quantity="RealizedGain",
             image_path=os.path.join(self.local_scratch.path, "3d2.jpg"),
-            show=False,
             convert_to_db=True,
         )
         assert os.path.exists(os.path.join(self.local_scratch.path, "3d2.jpg"))
 
         try:
-            p = ffdata.polar_plot_3d_pyvista(quantity="RealizedGain", show=False, convert_to_db=True)
+            p = ffdata.polar_plot_3d_pyvista(quantity="RealizedGain", convert_to_db=True)
             assert isinstance(p, object)
         except Exception:
             assert True
@@ -689,7 +685,6 @@ def test_72_antenna_plot(self, array_test):
             title="Contour at {}Hz".format(ffdata.frequency),
             image_path=os.path.join(self.local_scratch.path, "contour.jpg"),
             convert_to_db=True,
-            show=False,
         )
         assert os.path.exists(os.path.join(self.local_scratch.path, "contour.jpg"))
 
@@ -699,7 +694,6 @@ def test_72_antenna_plot(self, array_test):
             secondary_sweep_value=[-180, -75, 75],
             title="Azimuth at {}Hz".format(ffdata.frequency),
             image_path=os.path.join(self.local_scratch.path, "2d1.jpg"),
-            show=False,
         )
         assert os.path.exists(os.path.join(self.local_scratch.path, "2d1.jpg"))
         ffdata.plot_2d_cut(
@@ -708,7 +702,6 @@ def test_72_antenna_plot(self, array_test):
             secondary_sweep_value=30,
             title="Azimuth at {}Hz".format(ffdata.frequency),
             image_path=os.path.join(self.local_scratch.path, "2d2.jpg"),
-            show=False,
         )
 
         assert os.path.exists(os.path.join(self.local_scratch.path, "2d2.jpg"))
@@ -721,7 +714,6 @@ def test_72_antenna_plot(self, array_test):
         ffdata.polar_plot_3d_pyvista(
             quantity="RealizedGain",
             image_path=os.path.join(self.local_scratch.path, "3d2.jpg"),
-            show=False,
             convert_to_db=True,
         )
         assert os.path.exists(os.path.join(self.local_scratch.path, "3d2.jpg"))
@@ -731,7 +723,6 @@ def test_72_antenna_plot(self, array_test):
             title="Contour at {}Hz".format(ffdata1.frequency),
             image_path=os.path.join(self.local_scratch.path, "contour1.jpg"),
             convert_to_db=True,
-            show=False,
         )
         assert os.path.exists(os.path.join(self.local_scratch.path, "contour1.jpg"))
 
diff --git a/_unittest_solvers/conftest.py b/_unittest_solvers/conftest.py
index 6d581605884..5a0207899e2 100644
--- a/_unittest_solvers/conftest.py
+++ b/_unittest_solvers/conftest.py
@@ -18,6 +18,7 @@
 
 """
 import json
+import matplotlib
 import os
 import shutil
 import sys
@@ -206,3 +207,8 @@ def _method(project_name=None, subfolder=""):
         )
 
     return _method
+
+@pytest.fixture(autouse=True)
+def matplotlib_use_agg():
+    """Configure Matplotlib to use 'Agg' backend for all tests."""
+    matplotlib.use("Agg")
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 4e3a6246035..801d2339e39 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -277,12 +277,17 @@ def setup(app):
     # Must be less than or equal to the XVFB window size
     pyvista.global_theme["window_size"] = np.array([1024, 768])
 
-    # suppress annoying matplotlib bug
+    # Suppress annoying matplotlib bug
     warnings.filterwarnings(
         "ignore",
         category=UserWarning,
         message="Matplotlib is currently using agg, which is a non-GUI backend, so it cannot show the figure.",
     )
+    warnings.filterwarnings(
+        "ignore",
+        category=UserWarning,
+        message="FigureCanvasAgg is non-interactive, and thus cannot be shown",
+    )
 
     extensions.append("sphinx_gallery.gen_gallery")
     sphinx_gallery_conf = {