upon opening Libreoffice files my entire desktop display gets over MAGNIFIED! (My cat stepped on my keyboard.) please help.

When I click to open my LibreOffice writer files from the last few months my entire desktop (Windows 7 on ancient, refurbished DELL terra bit, intel CORE i5)and all files, icons, views, get magnified! beyond display monitor boundaries!
When I close these writer docs my entire desktop returns to normal size.
I think my cat stepped on my keyboard when my doc was opened.
Newer documents and all spreadsheet files do not appear to be effected.
Help please. I really need to access these docs and cannot because my entire desktop is blown up- too large to maneuver well.
?

I have a similar problem, In MS Word there is a simple button to return to normal size, Where is this funcetion in Libre Writer?