How to remove smoke from P_Fire particle in Starter content ?

Hi. I need to remove smoke effect on P_Fire particle system in starter content. I tried opening particle system and unticking smoke but it didn’t work. Is there any other way I can achieve this ?

that should be the way to go,
open P_fire and deactivate or remove the smoke emitter

Make a copy of the Fire particle, open it up in the editor and then just select and delete the Smoke emitter. Save the copy and then you still have the original one with the smoke in it should you ever need it.