Adobe Acrobat — Using Separate WindowsBy default, Adobe Acrobat/Reader DC opens multiple PDF files in a tabbed interface, within the same window. This means you cannot Alt-Tab between documents or place different documents on different monitors. To change this behaviour: - Go to Edit → Preferences.
- Click General on the left-hand pane.
- Untick Open documents as new tabs in the same window.

- Click OK.
- Close Acrobat.
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