You can add other map types and change their settings.
Clicking on the empty squares opens up a browser to search for texture inputs and assign them. You can add more or remove some as needed via Add New.
The texture project will auto-fill the material with the correct textures to display on the model. Click and drag the material applied on your mesh to the Linked Materials slot.
#Marmoset toolbag materials tiling full
You can set the Cage Opacity slider to full to easily spot when the high-poly is clipping through.