Here is what I am trying to accomplish, and maybe someone here can help me.

I am trying to make a simple box with a texture. The "floor" texture of this box is to be different, and scaled down.

I started up 3DGS, made a simple box, then hollowed it. I gave a texture to all of the walls then scaled down for a different texture for the floor. I selected the face for the top of the floor block (as shown). However, I cannot scale the texture down. When I change the values circled in red, it does nothing. Could anyone tell me what I am doing wrong? Thanks for any help.