SFSE Launch on Steam with In-Game Overlay – No mods required
Actually, there are mods for this, but there is also a simpler method.
Download the current SFSE here
https://www.starfieldmodhub.com/starfield-script-extender-sfse/
And add this to Starfield’s Launch Options in its Steam settings
(This is the Default path set by yourself)
“C:\Program Files (x86)\Steam\steamapps\common\Starfield\sfse_loader.exe” — %COMMAND%