EDIT

There is empty space between "Advanced" and "Id in Source" => with Name in Source on top this is not an issue anymore

The singleSource section contains an expandable part for additional informations of the source, the expanded part has empty space at the top.

The section has already top and bottom margin = 0, but the gap is only a little bit smaller, this should be improved

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Could we [...] make [the more label] not bold (we could try with italics, this may make it more clear that it is not a NEW section but it just continous the above section. (#9116#note-21)