Once you open a data table, you are redirected to the search window, where all the events corresponding to the tag you have selected appear arranged in rows and fields, forming the data table. This is where you can start to query your data, apply operations using the set of tools in the toolbar and customize the aspect of the data table, rearrange fields, filter the data, etc.
See the following sections to learn more about the options available in this are and all the actions you can take to modify your data: