Thanks for confirming, feel a bit better that I wasn't stuck on stupid with that.
A request for c_graph2 would be the option to change to knobs & a single slider or all knobs (unless I did miss it).
Thank you for reporting it. This is fixed, and the fix will be released in 1.2.4.
We can look into changing to knobs instead of vertical sliders as an option. As with all GUI things, layout can get tricky.