Split-screen multitasking on Nougat is great - I use it quite a lot when taking notes on my Nexus 6P in lectures or other talks that I may want to revisit later. However, one of the original multi-window features introduced back in the first N developer preview has disappeared in the 7.1.1 Beta; the swipe up split-screen gesture, found in System UI Tuner.

As most probably know by now, System UI Tuner is where you can go to perform risky, experimental changes to your device - turn on the fine-grained notification controls, for example, or turn off certain notification bar items. Until 7.1.1, a gesture for swiping up to set the window size for split-screen was in there too, but it has disappeared in 7.1.1 on multiple Nexus devices owned by Android Police team members, although it may still be found on the 7.1 build that the Pixel and Pixel XL run, interestingly.

Above: swipe-up split-screen gesture is nowhere to be found.

Hopefully, this is a feature that has graduated to being a default, or at least an option in the 'mainstream' settings, but has been missed out of the beta. Or maybe Google just decided to get rid of it. Either way, we won't be able to tell until we get the next build of 7.1. It would definitely go along with the 'polish' theme it's got going on. Anyway, we'll definitely let you know if it makes a return in any form.