Dark mode is supported on devices having Android 10. If you have a device having version 10 then you can disable Adobe Acrobat in dark mode by simply turning off the dark mode theme from system’s Settings. Follow the steps mentioned next to do the same: Open Settings app -> Display -> Dark theme -> toggle it OFF
You can also turn off the dark theme if you’re using device with Android 9 or above. Just turn off the Night Mode settings from the notification tray. Hope this helps.