This is a special kind of view command: It ensures that the class which contains the current object is visible – and all other objects are all hidden

This can easily reduce the clutter that you need to deal with. You can also use this action; to drastically reduce what you are viewing; and then selectively add the other class also into the viewing set

hmmm… as on April 14, 2019 we found that the button for this action is missing in its toolbar. This will be corrected in a future update