I find Flipboard Briefing is useful to me but it does consume quite an amount of data volume in the background every month. If you need or want to disable it, here is what you need to do.
I have documented the steps in video and screenshots.
Step 1 : Pinch zoom on the home screen.
Step 2 : Tap the "Home screen settings".
Step 3 : Uncheck the checkbox for Flipboard Briefing.