Can't disable tabs when opening multiple documents

I'd like to open new documents in separate windows instead of tabs. I tried disabling the preference to "Open documents as new tabs in the same window (requires restart)", restarted Acrobat and, when that didn't work, restarted my computer. Any ideas on how to fix this issue? I need to manually detach the tab every single time, and it's getting to be a real pain since I need to review documents side by side. Thanks!