Update yesterday via "sudo pacman -Syu", updated libreoffice-fresh. The update changed the default theme and messed up the format of the spreadsheets I use regularly. I'll try to install an older version and see if it gets fixed. I just don't know why an update would mess with the default theme unless it was something else that caused it.
I installed libreoffice-still-24.8.4-1 and everything is back to normal.
This means is an upstream change, unfortunately, and while breaking the theme is annoying, messing with the documents format upsets the workflow.