Apps not disappearing
I can see apps that I have recently used in the background whenever I open something with a black background
iPhone 8, 16
How to close an app
- From the Home Screen, swipe up from the bottom of the screen and pause in the middle of the screen.
- Swipe right or left to find the app that you want to close.
- Swipe up on the app's preview to close the app.
Close an app on your iPhone or iPod touch - Apple Support (IN)