Note: a new instance property panel is now live. Some things had been changed and enhanced: the old “up/down” buttons have been replaced by “up/down” keyboard arrows. You can learn all about it here: Scene Editor - GDevelop documentation
-Luni
I liked the plus and minus buttons for each parameter in the old editor to make quick adjustments on the fly. At least I think they existed. If not, I would like to request them either way!