Leads can be deleted from the detailed lead view, by clicking on the trash can as shown below:
Step 1:
Click into a Lead. Press the 3 Dots as shown and use the dropdown to select 'Delete this lead'.
Step 2:
To recover a deleted lead. Click your name. Use the dropdown menu to select 'Trash'.
Step 3:
Click 'Restore'. This will move the Lead back into it's Orginal Section.