It will be possible to delete multiple contacts at once in the Phonebook.

'Delete contacts' window

'Remove contacts confirmation' window
In order to delete multiple contacts the following steps need to be performed:
Click on the DELETE CONTACTS button located at the bottom panel of the Phonebook
The 'Delete contacts' pop-up window will appear. The window is divided into two sections:
In the 'Available' section, click on the + next to the contact(s) that are to be removed. Contact will appear in the 'Selected' section. Clicking on the - in the 'Selected' section, removes contact from the list for removal
Once the contacts are selected, press REMOVE CONTACTS button
Remove contacts confirmation pop-up will appear where one of the two options can be selected:
Deactivate - this option deactivates contacts
Permanently delete & anonymize data? - this option removes the contacts permanently from the Phonebook and Leon database. Once the contact is permanently removed it cannot be reinstated
Once confirmed, the proper action based on the selection is performed
The following types of contacts cannot be removed in the Phonebook: