The SignStick maximum resolution for Web and Google Slides to 1920x1080. When you connect SignStick to a 4K monitor, it may display the web content half screen.
To resolve this, you must disable Intel's Optimal Resolution feature.
With keyboard and mouse connected to the SignStick, select Windows-U, then the control panel, then select Intel HD Graphics.
Select 3D and uncheck "Application Optimal Mode".
Restart the SignStick and (Version 3.0.24 and above) should report to the display at 1080 resoluiton.