The Spinner tab is very straight forward, and contains just a couple of options to let you choose a spinner animation to display while grid media is loading.
From the Choose Spinner dropdown, select a number between 0 and 5 to pick from among the available spinner animations. A preview of your spinner will appear above the option:
Alternatively, you can also select “off” if you don’t want to use a preload spinner at all.
If you select a spinner numbered between 1 and 4 you will see an option named Choose Spinner Color appear, which you can use to set the color of the spinner animation: