You can find how to turn off cached exchange mode in Outlook in this helpful article.
The group will only become visible in Outlook once you have added your account to it. Check if you are a group member: Ensure that you include yourself as a member in the Microsoft 365 group, even if you are the creator of the group.Here are two reasons that could explain why you can’t find an email group in Outlook : Why can’t I find my Email Group in Outlook? You can compare Microsoft 365 Groups types in this article. While a distribution list is primarily focused on email communication to a predefined list of recipients, a group offers a broader set of collaboration features in addition to email, allowing for enhanced teamwork and coordination among its members. What is the difference between a Distribution list and an Email Group in Outlook? Finally, click on “Delete” to permanently delete the group.
Confirm your action by selecting “I understand that all group content will be deleted.” In the lower-left corner of the window, click on the “Delete group” button.