@Too Long Just to cover all bases, if you mean the height range of the section then you can turn on stretchy vertical limits in the section settings. By default sections are full height, but if you wanted to trim the view down for live details then these vertical height limits can be adjusted.
Apple iMac macOS Monterey / AC26UKI (most recent builds)
It might be because it's from an Interior Elevation, which has a polygon boundary linking multiple - not just a single elevation. In this case the horizontal boundaries can't be adjusted inside the interior elevation. The polygon of the group needs to be adjust on floor plan.