Today I cannot use Acrobat DC at all because it has no facility for changing the zoom level by clicking + or -. It also lost all my settings during yesterdays update. This is really incredible. "Show select and zoom tools" only shows Marquee, Dynamic, Pan & Zoom, Loupe, Actual size, Zoom to page, and Fit Width. Where is the +- tool???
As per the issue description mentioned above, zoom in/ zoom out buttons have disappeared after installing update for Acrobat, is that correct?
Could you try installing the latest patch for Acrobat using "Check for updates" option under "Help" menu, reboot the machine after installing update and try again. You may also download updates from here: Adobe software and product updates
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Let us know if you need any help.