Show Unlock Transition Effect button greyed out

[altladybug]

I would really like the ability to turn off the unlocking transition effect but the button on my S25 is greyed out. Any idea how to get this accessible again??

[Tourbillon De La Vie]

Live wallpaper on? Turn it off and try 

[altladybug]

I don't have live wallpaper, it's just a picture.

[Tourbillon De La Vie]

A custom theme in use? I'm assuming you've restarted the phone