My iPhone X is completely locked down with virtually no functionality (how I want it). I noticed today that if I am watching a video on the Dropbox app and I locked the screen, I can click the home button or lock button and controls for that video pop up, allowing me to play the audio from the video I had been watching without having to enter the passcode. I have the passcode enabled for my iphone and for Dropbox.
How do I disable this from being available? I am running the current version of IOS and have pretty much every function in the settings turned off or disabled. Any suggestions?