When I last opened this spread sheet on the 7th of February, all was normal - white back ground, black text. Today, I suddenly have black backgound white text and the whole thing is unreadable! This is a very important document for me, and I need help! I have tried looking at format - themes, but nothing is changing.
Yours sincerely,
Jacq Felis.
You have upgraded to 25.2.x.x in the meantime?
Probably the easiest way is to click Tools > Options > LibreOffice > Appearance and choose a new LibreOffice Theme (Office 2003 Blue will do) from the icon with tooltip Add more themes. Allow LibreOffice to restart.
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If you still have trouble, then this answer should help, New Writer loads in Dark Mode - #3 by vsfoote