I do not believe that is the right place for JVM arguments. I tried it and it still opens the early loading window.
log: https://paste.atlauncher.com/view/5128e4e6-c91e-4ac0-9037-5d133ae9668c
I already used MultiMC before this and they don't support forge. I tried AT Launcher and got this:
log: https://paste.atlauncher.com/view/a034546d-ce40-42f7-bbad-074c971264dc
I'm not entirely sure how to change the lwjgl version in the launcher though.
I'm playing on a Mac and when I launch from the normal forge launcher I get a GLFW error. So i'm using the Prism Launcher with java 8 trying to be able to make it run on a Mac. I've looked online but I keep getting hit with these logs and i'm not sure what to do.
Log: https://mclo.gs/OVzhZtd