Update app.py

app.py

@@ -43,9 +43,10 @@ add_to_header_button.on_click(add_to_header)
 def update_header():
     header_buttons.clear()  # Clear the existing buttons
     for button_name in buttons_to_add:
-        new_button = pn.widgets.Button(name=button_name, width = 50, sizing_mode='fixed')
-        header_buttons.append(new_button)
-        
+        header_button = pn.widgets.Button(name=button_name, width=50, sizing_mode='fixed')
+        header_button.on_click(remove_from_header)  # Add callback to remove the header button
+        header_buttons.append(header_button)
+
     # Update the filter list options to exclude buttons that are already in the header
     filter_list.options = [option for option in entered_options if option not in buttons_to_add]
 
@@ -60,6 +61,12 @@ filter_list = pn.widgets.MultiChoice(
     placeholder="Search Topics"
 )
 
+# Callback to remove the clicked header button and add it back to the filter list
+def remove_from_header(event):
+    button_name = event.name
+    buttons_to_add.remove(button_name)  # Remove from the header buttons list
+    update_header()  # Update the header and filter list
+
 # Layout using Template
 template = pn.template.FastListTemplate(
     title="EasySciRead",