I use Extended and enhanced panels
and have the same problem with the Quest Log. I've reported it there in the Comments but I'm not sure if there will be a fix, at least until SSG decide whether they're keeping this or not.
The part about this new "feature" in the Update 23.1.7 notes shows:
"BETA: The Quest Log and Quest Bestowal panels now support dynamic font resizing. To resize text, either press on the increase/decrease font size buttons on the bottom left of each panel, or hold down the Control key and use the Mouse Scroll Wheel when hovering over the panel text. This change will only persist during the current client session, and may be replaced by a different solution in the future."
The interesting part is the bit at the end where it says this "may be replaced by a different solution in the future." which might put addon authors off "fixing" it until SSG decide whether it's permanent or being replaced.