Another way is to select all the elements at once (not so easily done sometimes!) and choose Arrange > Ungroup. This brings them to siblings of their previously parent group.
Next to the menu at the top for selecting pages, there is an element selector. If you hover over its choices, it shows you a preview of the element.
Another way is the element tree in your screenshot, hover over the elements until you see the input in the preview, then expand the tree and hover over each child element until it shows again, keep repeating until you find it