Can't Access Material For Ground Plane

Hello everyone,

When I clicked “Use a material” under Effect in the Ground Plane panel, I wasn’t able to access the material to change the material of the Ground Plane.

Can someone help me out please on how I can access the materials to change the material of the ground plane?

Thank you,
Damon.

are you using some sort of display scaling?

it appears that half the panel is hidden,

try undocking it and redocking it