Windows on multiple displays move to the primary monitor after sleep [solution]

Windows on multiple displays move to the primary monitor after sleep [solution]

It appears Windows 10 keeps a history of all the monitors it encounters during its lifetime.  This includes the basic monitor support during the OS install.  So, if you enable "Show hidden devices" in the Device Manager you will see all the monitors connected to your system.

• Start Control Panel --> Device Manager
• Select View --> Show hidden devices
• Expand Computer --> Monitors*

When you expand the Monitors you will see your current monitor (highlighted) and all the disconnected monitors (greyed out). You may see monitors with "non-PNP" and "PNP" listed as well. I believe these are aliases to your current monitor (at a lower resolution) before Windows installed drivers for it.

• I uninstalled ALL the greyed-out monitors. Right-click on these monitors and select uninstall. Keep only the highlighted monitor you are currently using.

Uninstall all greyed out monitors (even non-PNP and PNP monitors)

• Reboot your system.

After doing this my windows don't resize after my monitor goes to sleep. You can quickly test this by temporarily setting your monitor sleep time to 1 minute.
Settings --> System --> Power & Sleep --> Screen [1 minute]