If there is a particular order that you require manual testers to execute their tests in, you can prioritize these test when adding them to a testing cycle. Below is an example of how to do this:
Prioritize the tests based on a test attribute - as an example,let's take the built-in attribute "Importance" and assign the attribute to those tests that you want to execute.
Set the attribute-value of those tests, you want to execute first, to value "Critical."
Set the attribute-value of those tests, you want to execute second, to value "High."
Set the attribute-value of those tests, you want to execute third, to value "Medium."
Go to Manual Execution Planning, filter for all "Critical" prioritized tests and assign them to your tester.
Filter for all "High" prioritized tests and assign them to your tester.
Filter for all "Medium" prioritized tests and assign them to your tester.
Go to to Assigned Tests grid and select your tester in the cycle. You now can see that all "Critical" tests are ordered first if you order by Execution Plan Order, then all "High" and last all "Medium" tests.
If you now start the testing cycle, go to the "Manual Tests Assigned To Me" panel and order your tests by the Execution Plan Order in ascending order -> All "Critical" tests are ordered first.