Full screen doesn't work on websites videos in Safari

After ANY iOS/iPadOS upgrade/update, you should ALWAYS perform a simple hard reset/forced restart of your Apple mobile device.

For iPad models with a Home button, do a simple hard reset/forced restart of your iPad by holding down both the Home and sleep/wake/power button simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

OR

For much newer design iPad models, without a Home button, try the new simple hard reset/forced restart procedure for the new 2018-2022 iPad Pros, 2020/21 iPad Air 4 and 5, the 2021 iPad Mini 6 and the new 2022, 10th gen base models,

1. Press and release the volume button closest to the top Power button

2. Then immediately press and release the volume button farthest from the top Power button.

3. Then, press and hold the top single sleep/wake/power button You will see the Slide to Power off button, but keep on holding down the power button until you see the Apple logo, then let it go.

Once you have performed all the steps, wait for a few seconds and your 2018-2022 iPad will boot up completely to the iPad’s Lock screen.

Best of Luck to You!

Hello Dawnclayman,

If your video playback is not working properly, you can try restarting the device if you haven't already done so.

Restart your iPhone

You'll also want to test out some different websites to determine if the video playback issue happens everywhere or just a specific site. If it is happening everywhere, you can try clearing the browser history to see if that helps. You can find that option in Settings > Safari > Clear History and Website Data.

If it's still not working properly, you'll want to contact Apple to report the issue: Get Support

Cheers!