Possible to set session log graph start date retroactively?

I forgot to start a new session in the new session log widget until about halfway through my brew. After creating a new session I only saw the “Start” button on the subprocess graph and after clicking it don’t see any way to change the start date (at all, much less to a time in the past). If this possible?

Yes. Click the button again to set an end, and then it’ll let you edit (and clear) start and end dates.

Ah great thanks. Is there room to include that edit button in addition to the start/end button when 0-1 are defined?

We’ll have a look at it, see if we can come up with some solution. The original design indeed is 100% due to space considerations.
Edit: done. Change will be included in next release.