You want some logic such as :
1. When any button clicked : Run Function "Hide All"
This would hide all the menu components with the Set Visible action.
Then you have separate logic such as :
2. When Item Button clicked : Run Function "Show Item Menu"
This function would contain logic that sets the Item menu to visible.
This is all done with "Set Visible". Also I would not be using cloned buttons as in that example. Set up buttons with different names such as "ItemMenu_Button" "CharacterMenu_Button" etc.