I managed to find what I wanted, but in Acrobat Online.
Steps to find this:
1. On the page: https://creativecloud.adobe.com/apps/acrobat-pdf you should see Acrobat Online - click Launch.
2. The page that opens should contain your documents and if you click on the one you want to change, it will open and there should be a panel on the right where you can access the recipients.
3. If step 2 doesn't show anything (at first it didn't for me), then go to the top right of the page (blue circle, aka your account) and click Settings.
4. Enable "Use classic Adobe Sign manage" and then go back to your documents and reopen the document until the panel appears. It did for me after I went into older docs so I assume it took awhile to sync, but not sure.
This page helped me find this setting: https://helpx.adobe.com/document-cloud/help/send-for-signature.html#Trackagreementssentforsignature