Split Screen
How can I stop the split screen from popping up when in Safari. I'm taking a class and mail keeps popping in as a split screen. It's not great for my comprehension. There must be a setting, but I sure can't find it.
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From the Mission Control hover you mouse over the split screen and click the X—split them up and back to Desktop.
Quit both apps, open them one at a time and put each into full screen, at least the Mail app to get it out of the way.
https://support.apple.com/guide/mac-help/use-apps-in-split-view-mchl4fbe2921/mac
Use Mission Control on your Mac - Apple Support