To identify the collection(s) that your object or node belongs to, select it in the Outliner, then right-click to display the marking menu. Select Render Setup to expand its submenu, and select from the following options:
This menu expands to list all of the render layers in your scene.
The collections are highlighted in the Render Setup editor and their properties displayed in the Property Editor.
In this example, the Find In Render Layer menu expands to list all the layers that exist in this scene. Because set:set_bathtub is a member of the set_props collection in the set_all layer, the set_props collection is highlighted and its properties displayed in the Property Editor.