Recently, Adobe Reader DC have started to always opening documents in maximized windows covering the entire desktop.
How can I turn it off?
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This appears to be fixable only by changing the
irandom registry entry to 0x1000.
Set the registry key
https://forums.adobe.com/message/8149543#8149543/irandom to hex 0x00001000 (decimal 4096), as described here in 2015.
For Acrobat DC (not Reader), there is a different key to make it remember the last window size/placement:
HKCU\Software\Adobe\Adobe Acrobt\DC\ExitSection, change
bLastExitNormal from 1 to 0