In-agent advertising: no means no

I noticed that there’s now advertising (of a sort) in the agent window this evening, announcing that a $20 credit to use Composer 1.5 is about to expire.

Good to know, but I have closed the banner several times, and it keeps reappearing. This is a poor show from a UI/UX standpoint, and I’d appreciate having a setting to inhibit these sorts of ‘special offers’ in the future.