Why is the screen on my libre office writer black

There are no prompts or anything

Mine is too. I’m on Lenovo ThinkPad in Windows 10

Please try resetting the user profile, sometimes solves strange issues.
Usually it’s enough renaming/deleting the file “user/registrymodifications.xcu”, it affect all the options in Menu/Tools/Options, and the files “user/basic/dialog.xlc” and “scrip.xlc” are overwritten, additionally custom colors in “user/config/standard.soc” are lost.

The most likely answer is that you have been hit by the OpenGL bug (both v4.4 & v5 are affected). See my extensive breakdown-with-fixes in the answer to Q64314.