ContextCapture Editor - STM edit to fill holes

Hi all,

I generated an STM from a point cloud DTM. Since that point cloud has holes where buildings were present on the terrain, my triangles of the STM has holes which must be "filled" and flatten as the surrounding terrain.

I don't find any tool to edit the triangles of the STM.

Is there anyone that has been able to achieve this edit? Would it be easier in OpenRoads Designer, that we also own?

Thanks.