When sending a single email to a student using the triple-dot menu or via the Chase by Email action, the default From Name and Email are decided by the following rule:
If the Regions app is set up, the application belongs to a specific region, and the Email Address is blank in the Student Chaser Email template:
The From Name is the Establishment Name
The From Email is the Region Email Address
If the Regions app is not used:
For single-send emails, the From Name and Email will be the current User's Name and Email Address.
For the Student Chaser Email, the From Name and Email will be per the template in Setup.