106 votes27 comments · Illustrator (Desktop) Feature Requests » Tools · Flag idea as inappropriate… · Admin →
We have added this in January 2021 release (version 25.1).
Please see this link to know more: https://helpx.adobe.com/illustrator/using/repeat-patterns-desktop.html
You can update to the latest release using Creative Cloud desktop App: https://helpx.adobe.com/in/creative-cloud/help/creative-cloud-updates.html
Thank you for all the feedback