Hello Christine,

Depending on the model of the laptop you typcally can only add two additional screes without extra accessories. An HDMI splitter will only produce one Desktop no matter how many screens are attached. What ports do you have on your laptop HDMI & Display? Let us know what Model laptop you have and the Model of your splitters so we can further assist.

Additionally WinKey+P is a shortcut in Windows to switch between different display modes with external monitors.