[brazen1]

After setting RGB Full 12bit at 23/24Hz, change to 60Hz and the bit depth field will be blank.  It is dithering down to 8bit at 60Hz.  That's because Windows is only compliant at 8bit when anything higher than 30Hz.  23/24Hz you can use 12bit because it's under 30Hz but as stated, this introduces lag and makes everything sluggish.  Unfortunately, we have to select 12bit and let it dither down to 10bit.  nVidia doesn't offer a 10bit setting using RGB Full.  Maybe one day they will correct that in a driver update.  So, when using Windows Desktop or in KODI, your NCP should show 60Hz with a blank bit depth setting (it's at 8bit).  When you start a video, it should match refresh rate (commonly 24Hz) and output 8bit or 10bit depending if it's SDR or HDR.  NCP will show 12bit but later in the processing this will dither down accordingly.  You'll have to window what ever player you're using to check in NCP.  With an MPC player, you can bring up the madVR OSD by pressing Ctrl+J and see what is being output as well.  I use 385.28 and these settings survive a reboot.  Newer drivers probably won't.  I wouldn't get too hung up on bit depth.  You could be doing more harm than good by introducing banding and everything at 8bit would be fine with little to unnoticeable difference vs 10/12bit.  Your main concern should be RGB Full and auto frame rate matching always returning to a 60Hz Desktop or GUI.