I don't think I have such a mode. Sometimes when I'm bicycling for ~20 minutes with nothing happening, I'll involuntarily switch to some enhanced-imagination mode for a moment, but I can't do that on demand.
To turn this on it takes effort and directed focus - the action is voluntary and feels like it takes effort, every time I do it my eyes lose focus and look straight ahead, I cannot do it while I’m looking up/down etc (I just tried). It’s a mental only exercise, it’s almost like you know when you move the muscles behind / beside your ears and you can wiggle your ears a little? That pull-back sensation is just like that.
To turn it off and return to normal takes no effort, it’s almost like dropping a ball and it falls to the ground, I just release and normal vision and stream of consciousness resumes.
I probably did a terrible job of explaining that, sorry