Using tags and tag cloud help users to search in the scenes. 

Tags are keywords which related to the tools of a scene. You can add tags to every scene tools in the wizard. 

If you want to reach the tag cloud of a scene then click on "Tag cloud" on the left-side menubar. 

Tag cloud shows not only all of the tags but the number of their occurrences too: as larger a tag is the more often it occurs. 

Click on any of the tags and then you get a list of scene tools where this tag can be found.