How does the Refill Dialog work?

I don’t understand this dialog box. At default, both spools have light grey arcs. If you select A1 or A4, one of the arcs will become darker like shown. What do the dark and light grey arcs mean?

I’m trying to have the filament from A4 to be used first since there’s less filament in it, and then switch to A1 as the backup. Thanks.

This screen is confirming you have it set up correctly to rotate from 1+4.

On the previous screen, assign the filament you want to START with. It will rotate to the OTHER ones if needed. If you have more than 1 backup, the order will be shown here.

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Ah, ok thanks. So loading the AMS from the previous screen is how you tell it to start!

Does the grey arcs have any meaning, then? If I have three spools of the same color/type, will the grey arc tell it which spool to use first as backup?