I'm using Adobe Acrobat Reader: Edit PDF (v. 23.12.00) on my iPad (6th Generation iPadOS v17.2).
Attached is a screen shot of what I am referring to. I would like to make "Browse more files" (Image 1.jpg) the default when I open the Files tab rather than than "On this iPad" (Image 2.jpg) because "On this iPad" doesn't list the folders or files on the iPad. I hope this helps clarify.