Files can be organized into collections. Each of those folders have specific search results in them. In order to check your collections and the results stored there, you should open the specific collection in which you added the files.
Go to the home page and click the Collections section on your LHS. In the page that will open choose the relevant folder and click on it. This will give you a list for you and you will be able to see all the collections that you have added in that particular folder.
Moreover, you can always remove, rename or open any collection from this page.
In order to remove a collection, click on the three dots to the relevant collection and from the dropdown menu click on the 'remove' button . This will delete that collection folder from your list. The number of collections will update as soon as you make any change into the list as well, so that you can have a clear number of collections stored in that list.