An instance can be flagged as visible or not by setting this variable to true (visible) or false (invisible). This works by telling GameMaker Studio 2 to skip the draw event for this instance, so care must be taken when using this as it means that no code placed in the draw event will be run while the instance is not visible. Also note that if the layer that the instance is assigned to is flagged as invisible, setting this variable to true will have no effect until the layer itself is flagged as visible too.
if other.visible = true
x = xprevious;
y = yprevious;
The above code will check the visible flag of the "other" instance in a collision and if it is set to true move that instance back to its previous position.