I must be blind, but I can't find the option to turn the grid layout on. Could someone point me in the right direction?
Check out -> [XB] Forum / Node List -> Node Layout Type, there's a few different node layout listed in the description.
Completely missed it since it was a text field. Sorry.

Also, is there anything I can easily do about this?
That's a default option in XenForo(his is slightly customized)

Go to Style Properties -> Forum / Node List -> Show sub-forums popup uncheck it.

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