Bake List

The bake list is where you set the textures you want to bake. Upon opening the panel, you'll see an empty list with a text alert below it.

As the text alert mentions, the bake list can't be empty, so let's add a new item to the list. This can be easily done by clicking the button with the + icon on the right side of the list.

After adding an item to the list, the text alert disappears, and the bake start button, along with the panel's name, are no longer highlighted.

The number of items in the list is shown in the panel's name within parentheses.