Problems waking MBP screen when connected to ext. monitor

Whenever the screen is closed and it goes to sleep (still connected to ext monitor) then its woken by opening the lid everything will default over to the ext. monitor and the MBP screen will be blank. Unpluging and repluging gets it back but then have to move the documents around again. Is there just a setting I'm missing for this? I've looked through all the system pref. No usb/BT keyboards, just a BT mouse and it gets disconnected on sleep.
Any ideas?
Thanks.

A Bluetooth device disconnect will often cause a separate and unwanted wake-up event. I'm guessing that might be happening here. After the lid goes down and the Mac sleeps, shortly after that the BT disconnect causes the Mac to wake again and, with the lid down, only the external screen is activated and hence all the windows jump to the external screen. Next time you wake by lifting the lid, you see all the windows have moved to the external display.
What I recommend trying is powering off the BT mouse prior to putting the Mac to sleep. You should get a message that the BT mouse has disconnected. Then close the lid on the MBP. See if that fixes the issue.

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