I can play/stop emitter to test and tweak particle fx in editor by using “view->play” menu. It works good for all type of effects except based on “emission space world”, like trails for example, because you just see one single blur/spot. So to test any your change - you have to check it inside game only.
I tried to move emitter using “move arrow controls” but no luck. So now it is only possible to see trails by build/start game and level.
In other particle editors - you can either just move emitter or even attach emitter to mouse pointer to test such things
Am I missing some way to move emitter based on world space in editor and see trails?