CELSYS has just updated Clip Studio Paint to version 1.9.9
The headlining features revolve around easier ways to edit vector curves.

Note that we’ve always been able to use Bezier curves in CSP, both on regular raster layers and vector layers. What they’ve added is “Improved editing”.
We’ll run through some of the important new editing and interface features below.

Update : 1.9.10 Patch
Using [Free Transform] with the [Object] tool on vector selections (selections of strokes in a Vector layer) was broken in 1.9.9.
This was fixed in 1.9.10. If you use this, make sure your Clip Studio Paint is updated to the latest.