Collidable Objects
Solid Shapes
A collidable object means that it is solid and can impact other objects. The collidable setting can be toggled in Advanced Options on most objects.
Collidable Enabled
A collidable object can be stood upon, clicked on, and collided with. Most objects are collidable by default.
Collidable Disabled
A non-collidable object can be moved through, like a ghost, cannot be clicked on, and will not collide with anything else. Some objects, like Triggers, Effects, and Google Poly are always non-collidable.
Collide As Group
By default, each part of a group will collide with an object individually. For example, if an arrow made from 10 shapes collides with a player, each shape in the arrow will collide rather than the entire arrow itself. Collide as Group overrides this behavior and causes the group to collide just once with its target.