Not sure I follow, forgive me.
is this a sudden new problem in an old installation?
Or is this a new PC/installation?
Or something else? new mouse? new keyboard?
Is your content on a locked layer?
You have PICKFIRST variable turned off?

Did you try resetting LT yet https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/How-to-r...

Your LT year version is...? OS is what please?

FYI setting the DYNMODE variable to 3 (not -3, not anything else, "active" means nothing sadly) is the default listed in HELP: see if that gets you part of the way to hat you seek.