In the PowerShell ISE editor, when you enter a dollar sign, an IntelliSense menu opens and displays all variables that are currently defined. When you now add more characters, you will not only see variables that start with these characters, but also variables that contain these characters anywhere in its name.
To see only the variables that actually start with the characters you entered, press ESC to close the IntelliSense menu, then CTRL+SPACE to open it again. Now, it will only show the variables that start with the characters you entered.
