Bake Mesh Maps Window not opening

Hi, I am using th enewest version of 3D Substance Painter and When I used the Bake Mesh Maps function this morning, under the Texture Set Settings, the window opened just fine and I was able to deelect the maps that I didn't want baked.

However, I think I accidently closed those options, before exiting back to the main Painter work area.
Now, when trying to use the Bake Mesh map function, that window, with the channels that you can select and deslect, as well as the ability to import a high poly version of your model, are gone.

How do I get that window back please?