In the 'Document tab' the "Expand All" button is very useful as I do not have to click on each nested document.

I would like to have the same functionality in the aggregation builder as it is annoying having to click several times to reach the information you want. Plus, as soon as I do any change to the aggregation stage I am working on this automatically collapses the document.

Also, when you have documents that have more than 10 fields it would be very useful to have the possibility to make each stage window expandable so that I do not have to continuously scroll up and down to get to the information I want.