Open the banner set with the banner you want to delete by clicking on the banner set in the banner set list. 

Find the banner you want to delete and click on the ⚙️ -button and then click "Delete".

And now click "Delete" and all banner versions for this specific format size will be deleted. If you for example have multiple 160x600 format sizes in the same banner set, only the one you select to delete will be deleted, the other(s) will remain.

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