Hide Node-RED console on Windows

You could run it as a service & you wont see the console and it wont quit even if you log-off

Example: Running Multiple Instances of Node-red using NSSM - #2 by Steve-Mcl

Alternatively, you could fire up node-red via FlowForge where you will get a whole suite of tools to help you fire up 1 or more instances at the click of a button