How to reproduce:
1. Create a new project
2. Open player settings -> Resolution and presentation
3. Select Fullscreen Mode -> Windowed
4. Make sure that the "Display Resolution Dialog" is set to "Enabled"
5. Build the Player, in the Resolution Dialog uncheck "Windowed" mode and click Play
6. Close the player, disable the "Display Resolution Dialog" option and build the Player again
7. Observe that the built player is still in regular Fullscreen mode

Expected result: the Player is built in Window mode
Actual result: the Player picks up the previously used configuration and switches to the regular Fullscreen mode even though the "Fullscreen Mode" is set to "Windowed"

Reproduced in: 2019.3.0a2, 2019.2.0b1, 2019.1.2f1, 2018.4.0f1

Workaround: Build the player with the "Display Resolution Dialog" again and run it in Windowed mode. Subsequent builds should now be in proper Window mode