How does BB Studio decide print order for a multi-filament print?

Two plates set up as follows. Blue is the filament used for the primary component of the print. It needs a brim. On Plate 1, the GoggleBox.stl object in blue has a blue brim as well. On Plate 2, GoggleBoxA.stl is also to be printed in blue, but the slicer generates a brim using the color in slot 3.

I think this is because on GoggleBoxA, the slicer is choosing to print with grey, first. But there’s no reason I can see that the slicer’s choice would be different. I am unable to find anything that lets me control this. Anyone know how I can “fix” the slicer’s choice of which filament to print first? I don’t want a grey brim on a blue print…

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