Short Answer 
To enable User1 to manage Group1 effectively, begin by modifying the group’s ownership settings to include User1 as an owner, allowing them to manage members independently. This approach simplifies administration by avoiding further configurations while enhancing member management efficiency.
Step 1: Modify Group Ownership
To empower User1 with the ability to manage Group1 effectively, the first step is to modify the ownership of Group1. This involves accessing the group’s settings within your management console and updating the list of owners. By doing so, User1 will gain the necessary permissions to manage group members directly.
Step 2: Add User1 as a Group Owner
The next step is to specifically add User1 as an owner of the group. This inclusion enables User1 to perform crucial tasks such as adding or removing members without needing additional administrative support. This adjustment significantly streamlines group management processes.
Step 3: Avoid Additional Configurations
By designating User1 as an owner of Group1, you effectively reduce administrative complexity. This method eliminates the necessity for creating an administrative unit or assigning a Microsoft Entra role, which often involves comprehensive configuration. You’ll achieve member management efficiency while maintaining oversight.