[beginner question] run sample projects

i am just getting started with creating a watch face, and have my first project running.

however, when i want to run the sample projects, i am unable to create a configuration,

when i select one of the sample projects in the "choose a project" dropdown, i cannot select a target device.

am i missing something? how can i run these examples?

projects i created myself allow to select a device, save the configuration, and run the app, but i cannot find what causes this difference.

btw, is there an easy way to add images here?