You can efficiently add or remove multiple users at once through the Admin Panel. Follow these steps to perform bulk actions

1. Log in to the Admin Panel and navigate to the People tab in the sidebar.
2. Click on the Bulk Action button, then choose whether you want to Add or Remove users in bulk.
3. Download the sample CSV file corresponding to the action you wish to perform.

4. Fill out the user details according to the provided template, and then save the file as a CSV.
5. Upload the completed CSV file to the designated file upload box.
6. Click Add Now to initiate the process.

Note: 

• If the operation is successful, the Status in the summary section will display as Complete. If it shows as Failed or Incomplete, click on View log to identify the reason for the failure.
• Users added via the bulk function will automatically receive the Member role. To assign the Admin role, you can either edit each user's role manually or add them individually using the Add User function. More details here.
• Admin users cannot be removed in bulk. To remove Admin users, you must delete them individually from the user list. Remove access article here.