Notepad always opens files using the same size as last closed Notepad file had. If you close a Notepad file maximized, it also opens maximized next time. If you close it when its size is smaller than full screen, it opens next time using that same size.
Solution is to use shortcuts. A shortcut lets you set the size of the application window. So, create a shortcut for your Notepad file, right click it and select
Properties, select
Shortcut tab, select
Run: Maximized, click
OK to close and save settings.
View attachment 209342
Now use shortcut rather than original file icon to open your file and it opens always maximized, regardless what size it had when last time closed.
Kari