Open your actor; on the left-hand side you'll see "attributes" beneath the actor's image. Scroll down that list to "Physics"; fixed rotation is the fourth or so option.
I'm not quite clear on your second question - are you asking after two actors collide, how do you make one of them pass over a third actor? Use layers to control whether an actor passes in front of or behind another actor. If you're asking how to make them pass over each other if they interact after their first collision, place the "collide" behavior in a rule or timer that limits when it is active.
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Open your actor; on the left-hand side you'll see "attributes" beneath the actor's image. Scroll down that list to "Physics"; fixed rotation is the fourth or so option.
I'm not quite clear on your second question - are you asking after two actors collide, how do you make one of them pass over a third actor? Use layers to control whether an actor passes in front of or behind another actor. If you're asking how to make them pass over each other if they interact after their first collision, place the "collide" behavior in a rule or timer that limits when it is active.