I know just enough about AE to get myself in a ton of trouble.
Version 16.1.1 (Build 4)
Mac Pro Running High Sierra.
I've got an animation on my timeline - all comp settings are 1920 X 1080. View is set to (fit). I animate away, keyframing, precomposing, and nesting my little heart out, making it look just the way I want it to.