To find a specific lead in the CRM, you can search by their name, email or phone number. Up to 10 leads which match the your search critiera will be displayed in the dropdown which appears below the search bar. You can view a specific lead's details page by clicking on the lead from the autocomplete dropdown.
The autocomplete will display all possible matches, independent of your current filters. To view all possible matches (within your current filters), click enter on your keyboard.