When a folder is selected in the test library, all tests contained within the folder are listed, including those in subfolders of the selected folder. This makes it difficult to determine which tests belong only to the selected folder.
For example, consider a top-level folder named General Tests that contains five tests and a subfolder named Advanced Tests that contains fifty tests. If only the five tests belonging to General Tests need to be edited, the user has to select General Tests then manually find the five tests out of the fifty-five listed that belong only to the General Tests folder.
Compare this behavior to how File Explorer behaves in Windows. When a folder is opened, all files within the folder and its subfolders are not displayed. Instead, only files within the selected folder are displayed, while all files within the subfolders remain hidden.
This feature should be implemented as a toggle in the test library so the user can choose whether to display all tests within the selected folder and its subfolders or just the tests in the selected folder.