If Test cases are added to Test Run after execution they would not reflect on execution screen. To reflect the changes on Test Run execution screen Rebuild the Test Run. Follow below steps to rebuild :
- Go to Execution Screen > Click on Rebuild
- Refer below screenshot.
Rebuild operation only show newly added Test Cases or Test Steps to Test Run with status Not Executed on Execution Screen. The existing executions remains as it is.
Here is the link to help documentation. Also, you may refer to this document to refresh the Test Case.