: Trying to reduce the area a layer can bee seen in After effects I'm creating a UI animation for a phone. I've got it so the menu transitions slowly moves in from the side. However as you

@Jamie315

You can make a new comp Cmd+N with the screen dimensions, and in the project panel, drag that new comp into your main comp. Then you can make the UI animations within that new comp and they will be updated to your main comp. The new comp size will work sort of like mask in this case.

If you've already created/animated the layers in your main comp, you can select them and choose Layer > Pre-compose… from the top menu, and the layers you selected will be put into their own comp. Then you can edit the settings of that comp to match the screen size.

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