Add a Zoom In & Zoom Out option in the UI panel like for instance Firefox or Pages on MacOS does. LibreOffice lack a simple way to just Zoom IN or Zoom OUT a bit.
In Firefox: View -> Zoom -> Zoom In, Zoom Out, Reset, Zoom Text Only
In Pages: View -> Zoom -> One page, Two page, Zoom In, Zoom Out, Actual Size, Fit Width, Fit Page, Zoom to selection.
To my knowledge only LibreOffice has a scrollable Zoom feature at the bottom right. Users used to other application might just want to Zoom IN or OUT with the UI or with a shortcut.
better UX, instead of playing with "percentage" just give the user the ability to Zoom IN or OUT with the UI or via shortcut.
User Profile Reset: No
*** This bug has been marked as a duplicate of bug 45705 ***