I’ve never looked to turn that on. My VR experience has been hit and miss, with sometimes frame rates acting very oddly, so I haven’t spent too much time with VR lately. Some of it may be related to motion reprojection not working well on current AMD drivers. So I’m kind of sitting on the sidelines seeing if things get better.
Yes at this point recommendation is to NOT use OpenXR Toolkit overlay until next version due to this bug.
WMR overlay us only for WMR devices (HP Reverb etc), not sure what you have. You need to install something called OpenXR Tools for Windows Mixed Reality from the MS store.