Yours has the same problem, so maybe is Start10 not updated with the new Windows update? I'm running Win10x2004, same as you. before this update you could actually search "update" and "mixer" and it'd pull up the Windows 10 applications/features now it jsut shows those weird AAA_ files
here is pic of what should come up after typing in mixer and pressing enter. Windows recently changed this to where in the second pic you have to click the advanced options (bottom middle). Also everytime i do open Windows Update (thru Win10 start menu not Stardocks Win7) it says update in progress with no update there, could that be an issue?