In order to assign the receipt template to register, you must edit the register. Please follow the below steps to assign the receipt templates to the register

1. Click Settings on the navigation bar and select Stores & Registers from the drop-down

2. Click on edit to edit the corresponding register

3. Scroll to the Receipt Templates field and select the receipt template required

4. Click on Edit Register to save the changes made

Note: Refresh the Register / Billing Screen to update the changes made