Final answer:
To turn the Properties and Project Browser windows on or off, you would use the Window command button found under the View tab in the software's user interface.
Step-by-step explanation:
The question pertains to the functionality of a software's user interface, specifically regarding how to manage display of panels such as Properties and Project Browser windows. On the View tab, the command button you would use to toggle the visibility of the Properties and Project Browser windows is typically the Window command button.
Within many software programs, especially within design and development environments, the Window option will provide a dropdown menu where you can select various panels and windows to display or hide, including the Properties and Project Browser windows.