When you select 'All', one, or multiple person records, a row of buttons appears at the top of the page. This allows you to perform the same action against all the selected records.
Send Emails
Send the same email to all the selected people (maximum 500 records in one go). Everyone gets their own email - there is no BCC type process involved and all the emails will be stored individually on the selected profiles' email tabs. You can personalise the emails with the recipient's name. We would recommend limiting this to 100 emails at a time (or in batches of 100) to prevent your domain appearing on spam lists.
Notes
Record the same email to all the selected people (maximum 500 records).
Ownership
Change the ownership of all the selected people to a profile you specify (maximum 500 records). You must have sufficient permissions over the people records selected to change their ownership.
Person Tags
Add or remove specified person tags to/from all the selected people (maximum 500 records).
Projects
Add the specified people to Assignments, Opportunities or Lists (maximum 500 records).
Delete
Fully delete all the selected people (maximum 500 records). You must have sufficient permissions over the people records selected to delete them.
Candidate
Add the specified people records to a specified assignment (maximum 500 records).
MS365 Contacts
Add the specified person record details to your own Outlook contacts list (maximum 500 records).
MS365 Emails
Set the 'Synchronise All' button (in the Email tab) for all the selected people (maximum 500 records).