From Users window, select mailboxes and retrieve their inbox rules by clicking on the ‘Message Rules’ button.

See selected users' inbox rules and their components including conditions, exceptions and actions. From here, you can delete rules as long as they are not 'Read-only'.

Due to Microsoft Graph API limitations, rules that are indicated as 'Read-only' will appear empty.

In this window, you can analyze how the inbox rules are constructed, and you can delete them by selecting rules (level 2 hierarchy) and clicking the ‘Delete’ button.