Output Path

Where to save the baked images. If Splat Map is active then this is also where the texture files will be copied over to.

Image Prefix

What to put in front of the output images to ensure they don't overwrite anything.

Resolution

How detailed you want your baked images.

UV Map Source

From where to pull UV Map information.

UV Map

Choose from existing UV Maps or add a new one in.

UV Attribute

Choose from exisitng attributes or add in a new one.

Bake

Bake out the texture images.

Texture Types

What texture maps to bake out.

Margin

Blender Docs

Clear

Splat Map

Bake out a colored mask and export the relevant textures to be masked onto the respective colors.

Here is a nice video explaining splat maps if you're unsure what they are or are for -> Splat Maps Explainer

Splat Map Target

Whether to bake out to an image or a vertex color map on the object.

Splat Map File Format

What format the baked image should be in.

Splat Map List

Here all your layers will be displayed. For each layer choose if it should be baked out and what color should be its mask.

Alternative Quality Level

Choose a different quality level for active layer in the Splat Map List