How to hide and unhide the right way using outliner and components
There is a right way and a wrong way to hide objects in your SketchUp. The more common way to hide objects is to select and right-click to hide them. Fig. 1 this way is problematic, because you must really know what you are doing, or at least remember what you were doing, to undo is not to unhide things that you have selected. This it is easy to forget what you have done. Fig. 2 to make the case even worse, how do you find the hidden objects in the scene? The easy answer is, if they are components and labeled, then you can always find them.
You can unhide by menu all or last, by this may not be the best option. Let's say you need a few parts to be hidden at one time, because you working on a wall or something that you need work closely with. Fig 3 lets say you need room 2 and wall 2 hidden, cause you need add something to the space. After you are done adding the stuff you want, how do you toggle on just room1? As in Fig. 3. The answer is the outliner.