Nope. They changed it again. They have removed the "hamburger" menu. They have a Menu item under the View menu (Acrobat | File | Edit | View | Window | Help). The menu on my Mac is Third item from the bottom : Disable New Acrobat. Choose this, restart Acrobat, then go to Preferences / General. Then deselect "Open documents as new tabs in the same window (requires relaunch)"
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