There are several things going on here, and the doorway effect has been mentioned. This is a thing and applies to the end of a task. But the tab open effect will hit you even mid task.
This is because sudden large screen changes clear a persons working space memory. It’s been studied and even very quick transition effects reduce this effect massively (sorry too lazy to go find a reference). Software designers can use this to mitigate this experience for individual tasks meant to be executed via multiple screens.
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