How to pin app design taskbar to the bottom in Adobe Experience Design, so when doing vertical scroll, it stays pinned to the bottom and always visible?
Update: This feature was added in XD's June 2018 update. To mark an element as non-scrolling, select the element and go to Prototype mode:
Then select "Fix Position When Scrolling" in the properties panel:
Be sure your fixed/pinned element is positioned "above the fold" in the artboard, otherwise it will never be visible at all.
This isn't possible in Adobe XD yet — currently, the entire contents of the artboard will all scroll. You can upvote the official feature request to raise its priority, and then you'll also get email notifications when its status changes.