BRoken Vertex, can't adjust it

[Anonymous]

check my pictures, i found that my vertex cannot be controlled.

but the vertex in my yellow object can be controlled. is there any wrong setting here ?

[TrippyLighting]

Your yellow object and "the other" objects are separate T-Splines. One of them is at the beginning of the timeline, the other two are toward the end of the timeline.

You are currently editing the yellow one.

To be able to eat one of the others you need to click on "Finish form", which ends the editing on the active, yellow T-Spine.

Then you can start editing one of the others for example by double clicking on the purple T-Spline symbol in the timeline.