Maybe something like this, only nicer ;-))
Switch it on - you see only the blue markers, switch it off - you see all of them (as it is now).
The question is - what to do with curvature buttons that are currently between the markers?
In the ideal solution - if you change the curvature between two blue markers, all curvatures between shaping points inside this section change to the selected curvature.
In a more simple solution, when you switch to “only blue markers”, the curvature buttons may disappear completely (lines appear in the same manner as with start and end points).