I can’t seem to figure it out. Is this referring to an auto-layout setting? Or something to do with preferred instances?

I can’t seem to figure it out. Is this referring to an auto-layout setting? Or something to do with preferred instances?

Best answer by Markus_Girlinger
It sets the content you drop onto the slot to "Fill container".
Note: It seems that if the slot uses Horizontal auto layout, "Fill container" is only applied to the height — and vice versa for Vertical auto layout (only the width is set).
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