Point Size with DX11

To use pointsize with DX11 mode, you need to use DX11 billboard shader:

Here is image with default point mesh shader (only works in DX9 mode)

And here with DX11 shader (supports "size" by billboarding each point)

Where to get those shaders?

DX11 point size shader's are located in: PointCloudTools/Materials/Shaders/Extras/ (you download latest versions from that link)