I tried 2 to 3 apps that lock every other app except photos.? what should i do? and also there is no option like samsung set to hide/unhide apps simply from the menu?
Put a file named .nomedia (no name, just the dot and the extension) in any folder you don't want Media Scan (which is how pictures are found) to scan. It doesn't matter what's in the file (or even if there is anything in it), as long as there's a file of that name in the folder.