On other forums this usually shows active topics from the last 7 days and often it is user configurable to show even longer periods (30 days or even more).

Would it be possible to at least increase "Active Topics" to 7 days?

The other search "new posts since your last visit" isn't a valid alternative for me as sometimes I want to revisit a thread that I was reading a few days ago and that didn't get any posts since, so it wouldn't show in this search, but it would show in "Active Topics" if "Active Topics" was covering at least 7 days.

Increasing "Active Topics" to 7 days would probably increase user activity (including helpful replies to support questions) on this forum as people who don't visit daily would see more recent threads than as is currently the case.