I did something wrong and can't reverse it
I don't really know how to phrase this (I've included a picture) and I feel inherently stupid having to "ask" this in the first place, but since I can't articulate it I haven't been able to find a solution (?).
I did something while editing and now I can't reverse it.
The bit at the bottom of after effects where you edit the length of clips and add transitions etc. isn't there any more and I'm not sure how to get it back. 
[Title edited for question clarity and future forum search... Mod]
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[Comments is to ask about the operation of the Forum, not a specific program]
[Moved from the Comments forum to the specific Program forum... Mod]