I had recently turned off the toggle for visual filters to demonstrate how this could be done. Now when I try to turn it back on, it does not function.
I see the same thing in (at least) some Bibles.
I did find that if I shift-click the visual filters icon in the Formatting tab, then the visual filters are turned on again and - subsequently - I can toggle them off and on without any problem.
I did notice most versions do allow Visual Filters, but NKJV and a few others have this issue. Shift-click didn't work for me.