How to make the column width full of space?

You can resize the column manually and then save the configuration.
I guess it’s the only possible option.

Thanks Ben and how to save the configuration?

You can either press the "Save" button on the toolbar or you can use save() API call – https://www.webdatarocks.com/doc/save/. The information about column sizes will be stored under the "tableSizes" key.