How to use the prop-o-matic?

How do I use the prop-o-matic? I am playing a public prophunt map with my friend (not made by any of us) but I cannot disguise as a prop. When I look at something, it turns blue as if I can hide but when using the attack button it won’t let me. However, she seems to be able to hide. Why can’t I do it? Is there any setting I have to change?

I’ve tried multiple maps and I’m the party leader if that’s relevant

Dunno if you still have the problem, but if u go to Settings > Creative > Posses Prop and change it to left click it should work, its right above the LTM controls

When you say go to settings and then creative where exactly is that? My options dont have a creative in the main categories.