Previously with old notepad app we have fixed sized dialogs regardless the screen size and orientation.
New version the dialog like one comes when you want to pen a file or save a file, which show case explorer will be of max width allowing a margin around the dialog for aesthetics.

Hopefully it turns out great and help full.
Did you notice new menu ? š
Well it would have new feature to quick change theme and more…
Please comment for any new feature request.