Paper Texture does not appear?

I just got Corel Painter 2020

So, whenever I create a new file, one of the options is a paper texture, near the option of color.

I select a paper, load up the file and... can't see, notice the paper.

I tried selecting other textures in the panel, but I see no change.

Canvas appear to be blank.

Even in painting, I can see the texture of the brush but not the brush on paper.

how adding texture work?