Update app2.py

app2.py

@@ -57,7 +57,7 @@ buttons = pn.Column(
         select,
         select2,
         visible=True,
-        sizing_mode='stretch_width',
+        sizing_mode='stretch_both',
     ),
     date_picker,
     css_classes=['hidden']
@@ -143,14 +143,15 @@ filter_list = pn.widgets.MultiChoice(
 # Layout using Template
 template = pn.template.FastListTemplate(
     title="EasySciRead",
-    header=[pn.Row(header_buttons, width=750, sizing_mode='fixed'), pn.Row(filter_list, width=250), pn.Row(add_to_header_button, width=55)],
+    header=[pn.Row(header_buttons, width=750, sizing_mode='stretch_width'), pn.Row(filter_list, width=250), pn.Row(add_to_header_button, width=55)],
     main= main_body_instance.update,
     sidebar=[buttons],
     accent_base_color="#88d8b0",
     header_background="#FFFFFF",
     header_color="#000000",
     text_align='center',
-    sidebar_width=150
+    sidebar_width=150,
+    sizing_mode = 'stretch_both'
 )
 
 # Run the app