Cascade Drop Down List (Using Distinct)

Power Apps Dropdown: Do you have controls that need to link together so that one filters based on the value of the other? We’ll cover how to achieve this with drop down lists, but also explain how it could be applied to other listing controls like listboxes, gallerys, etc. Not only will we use the Filter and Sort functions, but we’ll also make use of Distinct!

-Darren Neese with PowerApps Tutorial