Hello,
This behavior of the webix.print is explained by the fact that by default it takes the width from the initial datatable configuration. We can suggest you change this behavior with a little customization: Code Snippet.
Using the getColumnConfig() method you can get the current column width. And then, using the push() method, fill the array with the CSS-style with the previously obtained width. Next, use webix.html.addStyle to add a style with a width to each corresponding column, and after printing, remove them using webix.html.removeStyle.