This article shows you how to disconnect MailChimp from Shoelace

Sanja Smrzlic
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This must be done in MailChimp. To disconnect Shoelace from MailChimp, select "Extras" within your Account Settings. Under "Extras" select "API keys."

From there, there will be a section called "Authorized applications" where you'll  be able to disconnect the integration with Shoelace.