[ Critical issue and an urgent fix needed please or let me know if I am missing anything]
Looks like there is a critical issue in adding query parameter for API end points. While setting up and testing api requests for different query parameters, added query parameter is not showing up in API test screen. So it is blocking in creating parameterised api test collections.
Also if there is an ability to add magic texts while adding query parameters would be a great feature to use external collection with different parameters in run time.
At the moment only one api end point can be configured. So it is not really useful for setting for real projects.
Screenshots are here ( screens are as per flow steps)