Hi @hjula20, let me see if I can help out here!
I am not really sure on what you mean by "change first page of all display pages", could you possibly elaborate your question a bit? For example, do you want to change the wallpaper on the home screen or do you want to set a specific panel on the home screen as default home panel?
Please do elaborate as much as you can and I will do my best to assist you!
