The Substance™ Thea Converter interface consists of three parts:
You can change the size of each area or even hide one entirely, by clicking on one of the separators and dragging your mouse left or right.
The Textures Viewer presents the textures created from the Substance™ Engine. There is a different tab for each texture which has the name of the texture identifier (defined in Substance™). You can view the textures in their original size or make them fit in the available space by changing the Texture Size option (Menu > Options > Texture Size). The textures are recomputed every time a parameter is changed. If the Metallic/Roughness maps only option is ticked only textures identified as basecolor, normal, roughness or metallic will be visible.
In the Options panel you can see the parameters that were saved in the Substance™ file when it was published. Parameters hold values used during the material creation process so changing the value of a parameter results in changes in the appearance of one or more textures. Here you can tweak these values which causes an immediate regeneration of the affected textures. This way you can see how the final result is altered. The available options are closely related to the material structure so they usually vary from file to file.
In this panel you can specify what textures from the Substance™ file will be used for the creation of the Thea material and also see how that material will actually look. At the top of the panel there is the material preview area which shows the current preview of the generated Thea material. Below the image, you can see the Refresh button which you can use to update the preview when the Auto Refresh checkbox is not ticked. After that, there are three groups of options. The first group contains settings for the material preview environment and the other two groups allow you to map textures from the Substance™ file to the Thea material texture slots. You can collapse or expand any of these three groups by clicking on its title.