I just received my U3818DW and have it connected USB-C to my XPS 13. The laptop is set to not sleep when plugged in with the lid closed and set to only use the U3818DW as a display.

Dell Display Manager is setup for 6 individual sections of the screen.

When disconnecting the U3818DW, all the windows return to the laptop screen. However, if I reconnect the XPS to the U3818, all the windows appear in a single section of the screen.

Display manager isn't remembering window positions. Is that not possible or is there something I'm missing.