How to turn on back face culling in retopflow plugin?

Hi all

I want back face culling on in retopoflow but I am not able to find the option to turn it on.can anyone help me?and how to increase vertex opacity?

AFAIK back face culling is not visible in solid view but only in material previw or rendered when using EEVEE… anit’s setting is in Material Properties → Settings … and has nothing to do with retopoflow… if this doesn’t switch viewpost shading/ settings …