DXP menu (user button now I think?), or right-click toolbar/menu area, Customize. Look for "Snap Grid". Have fun.
It's a not well known/understood/appreciated/used feature, I think? Granted, there's more than enough functionality in AD just to get used to in the first place, remembering all the default menus as they are, let alone the shortcuts, let alone customizing your own. There are just a handful of changes I've made, to this day. Potentially very powerful feature... or dangerous too, hehe.
Tim