New Features - any way (Settings) to disable Picture-in-Picture (IOS) ?

my (80-some-year-old) mother watches Everything on her iPad, including Plex which i load up with her favourite shows.

accessibility issues aside … is there some way (in, say, Settings) to disable the Picture-in-Picture feature? she gets confused enough as it is. i’d like to be able to “dumb-down” her UI experience with Plex.

Early 2021 clean-up: use the settings of iOS → Settings > General > Multitasking & Dock, disable Picture in Picture