Hi,
First let’s get some settings in the 3d viewport (robot positions is necessary, tools is not)
Now you can select the points as you can see them (ctrl + drag or select tool)
Next stop is to untick the is reference. This should allow you to modify all the selected points.
EDIT:
deleted edit
EDIT 2:
Sorry, I mis-spoke, keep IsReference ticked IN.
br,
Lefa