In the Chord and Marker tracks, you can just click on the section to edit its content. This is the most intuitive way.
However in the Arranger track, you cannot edit the name of the section without opening the Inspector track. (As far as I can tell anyway.) Now...
1) It's not intuitive, so I had to look it up. You want it to be intuitive.
2) You don't usually need the Inspector track open unless you're tweaking clips so I normally keep mine hidden. This is an additional couple of clicks to the work flow to open and close it.
3) The inspector isn't visually tied to the timeline so it's harder to tell which part is which while renaming them.
I want to be able to type in the name to the section directly in the Arranger track the way you do with Markers.
Right now the double click on the Arranger track zooms to that section. So maybe either add a right click "Edit name" option, or just have a single click on it, then hover over it for a second, and it will go into Edit name mode and let you type in there.
With the arranger track half of what you will be doing is adding and naming sections so it makes sense for naming to be as easy as it is to add them.
Thanks. Studio One is my favorite DAW by far and has been for years.