Multiples Display

Hello
We are new to Presenter and need help.
We currently have 4 display screens connected to the laptop through an HDMI splitter. How do I set up to send different displays to each one of them?
Example: i want to send a specific message to the choir through the stage display without the message being projected to the other screens

An HDMI splitter takes one output and sends it to multiple displays, meaning the computer recognizes all four screens as just one screen. The computer must recognize each display as a separate unit for Presenter to use them all independently from one another.

You'll need to look for a dual monitor adapter. You can still use the splitter for the three main screens but use a separate cable for the Stage Display. With this setup, your computer should recognize 2 displays -- 3 connected as 1 through the splitter and 1 on its own for the Stage Display.