Oh ok, it doesn't seem like the overwrites were intentional. I find Menlo an easier typeface to read and scan than monospace, but I'm hesitant to change it especially if there's no pain associated with Monospace. I'll send out a message on the mailing list and see what the feedback is on current typeface used.
OK.
On another note, headers for tables (for example under statistics tab) are currently bolded and 12px. Headers for dialogs are 13px and bold. To keep it consistent with other typography in the app, both should be 13px and not bolded. By updating them, they will be consistent with the editor title in the query tool which is already 13px and not bolded.
Iirc, we did some back and forth over that about 18 months ago, as dialogues didn't look quite right without the bold - and I do think that it looks a little light on your mockup. I don't think there's a hard requirement they match table headers; they are distinct types of header.
Happy to try out change though if you can workup one or more suggested patches.
Current:
Update (these are all 13px not bolded)
Editor title in query tool (currently 13px and not bolded)