The custom search is used to build a custom search form where the user can enter specific values. Each field in the form can look for exact matches, text that contains a value, doesn't contain a value or is greater than or less than a specific number.
This tool is favored over the query in cases where you only want the end user to look search based on specific criteria such as a building ID.
Enter values into the custom search box. In this example the custom search box is open by default, this can be set in Interface Settings -> Layout -> Default Tool Panel Configuration.
Try typing in 40 for the number of floors and 1971 for the year and press GO.
From the administration area of your map the custom search tool can be activated from the toolbox panel in the administration toolbar. See the following section in the documentation for more details.