Whether you want to change stages, update assignee, or delete leads/processes/properties, you can select 100 at a time or select individual records. (For using bulk actions, you can only select 100 at a time.)
To select the first 100 records, use the select all checkbox at the top of the list.
To select specific records but not all in the list:
Go to the list of leads, processes, or properties you want to select. Click the check box next to the item you want to select. In this case our selection is Jonny Smith .
Then go on to select the rest of the records you would like to update.
Now you can update your selected leads/processes/properties (for more on what you can do in bulk, check out this article).