Cannot move or position Comp tracks in Timeline panel
Hi everyone! I'm a fairly new user to After Effects, and I've been struggling with this basic feature in the Timeline panel. Apologies for the redundancy.
I'm currently attempting to combine two comps (let's call them Comp "A" and Comp "B") within one (Comp "C"). I have set A and B at 5 seconds each; C is 10 seconds — thus, I would like B to begin immediately after A has finished playing halfway through C, the entire composition. I've placed both A and B within C, but both tracks on the timeline (the gray bars – I believe "track" is the correct terminology) begin at 00:00. When I try to click and drag one, the tracks refuse to move, but the layers are not locked. How exactly can I move these tracks in the Timeline panel? Is there some setting that I can use to "unlock" them WITHOUT disrupting their respective keyframe settings? I assume the issue stems from the fact that these are comps and not text/shape/etc. layers.
I've thought about prerendering these comps and then merging them together within Comp C. Think this could work?
Please see screenshot attached, I've highlighted what I mean. Thank you everyone for the help!

