As I was able to understand the issue from the description mentioned above, if you have a pdf minimized (pdf 1 for ex.) and when opening (pdf 2), and closing that pdf, pdf 1 will maximize, is that correct?
Could you confirm if you have "open documents as the new tabs in the same window" option is disabled under Edit > Preferences > General?
Also, let us know the operating system you are using- Mac or Windows?
Yes that is correct. If one PDF document is minimized, it will maximize and become the active window when another PDF is closed.
Thank You for the screenshot. We have reported this issue to the product team and they are looking into it.
We plan to release a fix in the near future, appreciate your patience.
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Adobe Acrobat and Reader official update (19.008.20080) containing the fix for this issue is now available. This update will be automatically pushed to all existing installations of Acrobat and Reader. If you want, you may also manually trigger the update early by opening the application and going to Help > Check for Updates.
More information about this release is here: 19.008.20080 Optional update, October 22, 2018 — Release Notes for Acrobat DC Products
Please try it out and let us know your feedback.
Thanks for your patience and support!
Thank you very much for fixing this bug.