Auto lock
My auto-lock is grey and I can’t change it. Unfortunately it shuts down at 30 seconds. I have updated to 17. I have a brand new 9th generation
iPad (9th generation)
Your iPad will automatically dim and then switch-off the screen, to save power, when inactive.
iPad auto-lock will be fixed at two minutes if you have enabled Low Power mode:
Settings > Battery > Low Power Mode - set to OFF