looped_around
There are options to hide apps and/or mark them as favorites (you could only display your favorite apps by pressing the little star for example) - it works the same way with apps installed in Private Space.
Icons from apps in Private Space are only displayed while Private Space is unlocked. You can recognize them by a small Private Space badge on the respective icon.
(You didn't ask but: You can also rename apps - which I personally find a handy feature.)