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There's a lot of documents surrounding setting up SSL Decryption, I'll link a few of them below. The screenshot that you posted just says that you aren't following best practice on the profile, but decryption would actually be "activated" so to speak by setting up a Decryption rulebase policy. You'll definitely want to read up on that prior to activating it; there's client changes you'll need to make so they don't get security warnings and potential legal requirements depending on what regulatory bodies you may fall under and local laws.
The second link has a video that @jdelio made that walks you through the process of getting this setup.