Hello. I am wondering whether anybody has found a work around for not having a screen saver trigger time for each display?

Here is my situation:

I am studying to be a genealogist
I can't handle paperwork as I have cerebral palsy
I use one display to view PDFs and images of historical documents
My primary display is used for LibreOffice Write
I could just turn the secondary display off periodically, but this will eventually loosen or damage its bracket as my movements are not controlled

If anybody has any suggestions, that would be great

Thanks,
Sarah