Have you installed the2023.1.3 Update yet? ABOUT command will confirm what you have installed. If not, get it from your Autodesk Account Page here https://manage.autodesk.com/cep/#products-services/updates
Restart your PC afterwards.
If that did not help... Set GFXDX12 variable to 0 (that's a zero) then restart AutoCAD/LT. See if that helps..
Also consider turning off LINESMOOTHING and LINEFADING variables.
If still no relief then start GRAPHICSCONFIG command and change the 2D Display Settings pulldown from "advanced mode" to one of the other choices.
If all else fails, then turn off Hardware Acceleration as a last resort, any help there?