To archive one contact:

In the Contacts tab, click on the contact you want to delete.

Select the three dots > Archive Contact.

A prompt will appear, then select Archive.

To archive contacts in batch:

Put the contacts into the selection cart, then click on the three dots > Archive Contacts.

A prompt will appear, then select Archive Selected.

To delete the contacts after being archived:

In the left-hand banner, select Archived Contacts.

In the Archived list, select the Delete Icon.

When prompted, you can just select Delete.

If you want to unarchive a contact instead, select the Unarchive Contact button.