Samsung S21

[Shazoo70]

Built in camera app not showing. Suddenly vanished of my phone.

When I go to my settings & then scroll trough apps its there. Very strange 

[Flintstone]

maybe by accident you moved it into a folder.
in the appdrawer ( swipe up at homescreen) search for camera and then add it to the home screen again.

[99kingcone]

if you can't find it, then go back to your apps in settings, uninstall it, and then reinstall the app , and it should show on your home screen