Do you want to open your PDF files separately in Adobe Reader?
Are you looking for a way to set Adobe Reader to open multiple windows of PDF files?
In this tutorial you will learn 3 ways to open your PDF files separately, not in a tabbed view in Adobe Reader.
Let’s go!
Open PDF Files in Separate Windows in Adobe Reader
Open New Window
The first method is to open a new window by going to “Window” > “New Window“.
Drag the Tabs Out
The second method is to drag & drop the tabs outside so it opens into a new window.
Change the Settings to Open Separate PDF Files by Default
The third method is to change the settings to make Adobe Reader open PDF files in new windows instead of new tabs.
Go to “Edit” > “Preferences“.
In the “General” category, under “Basic Tools” uncheck “Open documents as new tabs in the same window (requires relaunch)“.
Click the “OK” button and relaunch Adobe Reader.
If you have any ideas to share or questions to ask feel free to leave a comment below!
Thanks for sharing and see you in another easy tutorial 
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found the drag out method works but how to re-integrate to previous window
version in 2023 no longer has the same option.
I have researched this issue elsewhere. The only solution I have found in the 2023 version of Acrobat is to go to the hamburger menu in the top left, and select “disable new Acrobat.” That will take you back to the prior version of Acrobat which allows the viewing of files in separate windows.
Anna’s idea worked for me too! I’ll throw out some keys words so other can find this when searching: Adobe PDF Open New Separate Window 2023
Hello, Thank you so much!