SSMS 17.3 and beyond, no more text editor color options
This problem and workaround attempts are abundantly discussed in this very long thread.
See attached screenshot.
Mikael Wedham commented
I also have had the same issue. And still do. Installed yesterday with same result.
The things available in Options - Fonts and Colors are:
[All Text Tool Windows]
[Watch, Locals, and Autos Tool Windows]
Importing settings from a really old SSMS where I could change and export works, but I would really like to be able to change the settings myself.
1. I installed a lot of versions up to ( and including 17.9) on a Clean reset Windows 10 OS.
2. I have upgraded also on other Machines - only full install package.
Never uninstalled and reinstalled. I reset the entire OS.