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it's your Composition Panel set to 2 views, and not the RAM Preview (actually it's Preview now and not RAM Preview... you can call it Mr. Preview if you want to get fancy). knowing how to describe your problem is halfway towards a solution
set it to 1 View and you will be fine!
These views are used for 3D to show different perspectives and orthographic views of a 3D scene. when in 2D they have no use. if you clicked the option to show 2 views or more they will appear unless you change it back manually. even when resetting your working space, they will appear - so I get why this can cause confusion.
more about it here: https://helpx.adobe.com/after-effects/using/modifying-using-views.html..
Thank you so much bro!
You're welcome! you question will remain as unanswered until you mark the response as correct