Highlighting Tesxt

The "usual drill" would be:

Restart, preferably using the 'hold the power button for ten seconds' SMC-reset-Equivalent.

run in Safe Mode, where no third-party anything is loaded automatically

create a new User, log in as that user, and see if the problem follow your User account

contact support:

Official Apple Support

.

Your post will be here for a long time, and others will find it by searching.

If you could summarize what you think provided the solution, it could help 'the next guy'. and Thanks!

have you added any Mac enhancers or third-party anti-virus, speeder uppers, cleaners, optimizers, or a VPN you installed yourself?

Reset the SMC of your Mac - Apple Support

System Preferences > General > Highlight color ...

Set it to something LOUD, not subtle. ¿working now?

what model-year MacBook Pro, and if 2020, what processor?

what version MacOS?

light, dark, or Auto Appearance?