You can automatically fill a field with a specific value every time the form is loaded. To find this option go to:
Open the field settings
How this function works
There are a few things you need to know
The main goal of this feature is to be an easier alternative for prefilling via URL.
This option is available for all fields (except for computed and attachment).
The feature would apply while creating OR editing records. But the default values would only be set if the field is empty (the same behavior of URL prefilling).
When the form is prefilled via URL, it is possible for the end user to manipulate it. This feature solves this problem and prevents the form user from changing the prefilled value.