If your panels are all over the place and you can’t find anything, don’t panic. You can reset your workspace in seconds.
Steps to reset workspace
Go to the top menu and click Window → Workspace → Reset [Name] to Saved Layout.

Everything snaps back to the default layout for that workspace, and you’re back to a clean starting point.
One more thing
You can do it anytime — experiment with layouts without worrying. It’s like a quick “undo” for your interface, so don’t be shy about trying different setups.
Related how-tos
How to dock and undock panels in After Effects
How to change display quality for faster previews in After Effects
How to switch between views in After Effects
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