You can add customers to your favourites. This will allow you to easily access these customers from the main menu.
How to add a customer/work address to favourites:
Click the menu icon (3 horizontal lines) in the top left corner.
This will open the menu. Click the search icon and search for the customer/work address you'd like to favourite.
Click the customer/work address to view their details. You will see a star icon next to their details. Click this and the customer/work address will be added to your favourites.
Go back to the main menu and click 'Favourite customers' to view the customers.