Acrobat DC is an absolute PITA to use. It has no UX continuity with the rest of the CC suite, the tools are allocated to the vaguest of places and the basic functionality that is regularly used, Marquee Zoom Tool especially, are relegated to the top menu when they should be in the header with the page controls. These are tools that are regularly used, unlike the '-' and '+' buttons and search tool that are in clear view.

It's a pointless, redundant redesign that causes more problems and waste of time than it actually serves. Bring back the layout of 9.