When I start Libre Officve Writer 7.5.5.2, I get this:
Anyway to change those icons to a different color? Bold, Italic, etc?
For a relevant answer or suggestion, edit (= modify, don’t use a comment) your question to mention OS name. Have you configured a dark theme in the OS?
If you only want to change the icon color (and everything else doesn’t matter for you right now) you can go to Options > view and change the icon themes.