How to disable advertising in Windows 10 File Explorer

Most of us have become resigned to Windows 10 serving up ads in many nooks and crannies. Now it seems Microsoft’s latest ad platform is File Explorer.
That venerable center of most Windows users’ navigation can, on occasion, show an ad like the one below. The ads appear on some Windows 10 Anniversary Update PCs, and it looks like they’re going to become more common with version 1703, the Creators Update, due later this month or early next month. (This screenshot is from build 15048, a recent beta test version of 1703.)
Fortunately, it’s easy to tell File Explorer to stop nagging you.
To get rid of advertising in File Explorer – at least, this kind of advertising – start File Explorer, click View, then Options, then in the View tab, uncheck the box marked “Show sync provider notifications.”