I have always had black text on a white background. I opened my document today to find I have a black background on which the black text does not show up.
How do I switch it back to a white background?
Hi 
Welcome to the forum.
Ctrl + ,
Also check to see if you didn’t accidently switch to dark mode: (options panel still, bottom left – “Manage”)
“Default” is all light gray and white.
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Thank you!
Options (which is under file in my version) to Manage to clicking on Default and restarting did the trick!
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You are very welcome.
Ctrl + , (comma) is the default shortcut to the options. (Which is otherwise to be found under File, indeed.)