Press and hold the Back and Overview/Recent apps buttons together
Press and hold the Back and Home buttons together
Swipe up from the bottom and hold, then tap Unpin
Enter your PIN, pattern, or password if prompted
Open Settings
Tap Security or Lock screen
Tap Screen pinning or App pinning
Turn off Screen pinning
Use the assigned shortcut to exit pinned mode if enabled
Restart the device if the screen remains pinned