Hello Arzhang.

Thank you for your purchase.

To be able to change the width of the columns, you would have to disable the "Scrollable" option in table's settings.

Then, you can add a class to each column, for example "narrow":

Then, go to main settings of wpDataTables, and navigate to Custom JS and CSS tab, and enter this in the Custom CSS field:

table.wpDataTable .narrow {
white-space: normal !important;
width: 130px !important;
}

This will allow word wrapping for headers and limit the width of those columns where you applied the CSS class to 130px. You can adjust it to fit your needs, of course.

I hope this helps.

Best regards.