Workspace Zoom Initialization Defect

I use MuseScore 4.2.1 with a touch sensitive notebook in portrait mode as a reader while practicing piano. The view is continuous and vertical. Zoom is at 81% with no margins. I have saved a workspace called 'my new workspace' (which I think is identical to Default). When the app first loads with either of these two workspaces, the layout is not correct. The zoom is not set on initial load of the project file. If I close the score and reload it the score appears with wrong zoom. My workaround to correct the layout is to switch back/forth to the other workspace, as both workspaces when selected will position the page with the appropriate zoom.

Second issue: While practicing past the bottom staff I need to reveal the rest of the song by scrolling the page down. This requires placing my finger at bottom right side of pane and sliding the finger up to the top right corner. Slipping left or right reveals margins and hides content that I have to correct with my finger. Sometimes I inadvertently select a note or a bar that then shows a cursor highlight or worse changes the note which has me pressing undo. I would like a rehearsal mode where the score is readonly and instead of a playback toolbar there are big up/down scroll buttons that can position the page instantly without me fussing with the interface.