[SOLVED] End of net name is added +/- for differential pair, but at pcb, differential routing is disabled?


I follow this https://forum.kicad.info/t/net-names-for-differential-pair-router/2822 link to define differential pair, but at the pcb side, under route->differential pair and dimension->differential pair, the selection is disabled.

is there any setting I need to set to enable the differential routing?

i am using version 4.0.6, window version.


Just found the solution shortly after post.

I need to switch to open GL under View->Switch Canves to OpenGL