After Effects lets you customize your workspace by docking and undocking panels however you like. Set it up for how you work, not how someone else thinks you should.
Steps to dock and undock panels
Click and drag the name of a panel (like Timeline or Effects). You’ll see blue highlights showing where you can dock it.

Drop it into place and it snaps into the layout. To float a panel, drag it out so it becomes a separate window.

Resize panels by dragging their edges — make the timeline bigger, shrink the effects panel, whatever you need.

You can also save your custom layout. Once you’ve got your workspace exactly how you like it, go Window → Workspace → Save as New Workspace and name it something you’ll remember.
One more thing
If your workspace ever gets messy, just go to Window → Workspace → Reset [Workspace Name] to Saved Layout and it cleans itself up.
Related how-tos
How to draw masks in After Effects
How to create a circle mask in After Effects
How to use the pen tool in After Effects
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