Solution
TestStand is application software that helps engineers quickly develop robust automated test and validation systems. As a complex software, it has several shortcuts that are tied to its most common functionalities. Two of those shortcuts are the CTRL+F5 to run a sequence in Single-Pass mode, and the F5 to run a sequence in the Test UUTs mode. On the TestStand development environment, you can expect those shortcuts to work as stated here. In the Related Links section, you will find a link to an article with all the TestStand shortcuts.
To fit users' needs, TestStand includes already built-in user interfaces that are programmed using different platforms, like LabVIEW, LabWindows™/CVI, C#, Visual Basic, and C++. There is a known issue on the LabVIEW user interface, in which those shortcuts are not exactly the same. Here is an image of the LabVIEW Simple user interface:
Here, to run the Test UUTs button with a shortcut, the combination of keys is CTRL+F5. And to run the Single Pass button, the combination is CTRL+SHIFT+F5. It will be the same for both the Simple and the Full-Featured user interfaces.