Hi,
The best practice is to create an Active Directory (AD) Security Group. You can share the app with this group, which allows you to add or remove users easily. You can also add users in bulk to this security group from the Admin Center or even Outlook.
Keep in mind that this is different from an Office 365 (O365) Security Group. With an M365 Security Group, you can't share apps. Alternatively, you can click on the three dots in the top right corner and switch to the classic Share Mode to continue sharing the app as you did before.
Hope this helps!
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