The description of the immovable object spell (Explorer's Guide to Wildemount, p. 187) says:
You touch an object that weighs no more than 10 pounds and cause it to become magically fixed in place. You and the creatures you designate when you cast this spell can move the object normally. [...]
If the object is fixed in the air, it can hold up to 4,000 pounds of weight. [...]
So does this mean that to the caster can move the object at will, and wherever he lets go, the object just sits there (in 3-dimensional space)?
Can the caster place the object in the air and swing on it or climb using the "immovable" aspect himself? If so, is it a free action to activate, since no action is listed here?