Hi danielphillips86,
Thank you for your purchase.

If you take a look at a tooltip you will see that you can enter the % sign for the column width. (attachment) 

As for the custom Css class, you must give all of the desired columns a Custom CSS class and then write the code to set the width of them.

Do not forget to add !important tag at the end of it.

Best regards.

Hi danielphillips86,

Can you please tell me is the scrollable option is checked in the table settings (attachment) 

If Scrollable option is checked the Limit table width option would not be visible and the width option in the column settings (from my last attachment) is only visible if the Limit table width option is checked.

Best regards.

Hi danielphillips86,

Enabling the Scrollable option will not show the column width, sorry if I did not explained better below.

If you disable Scrollable option you will see Limit table width option, If you enable Limit table width option the column width option will be visible in the column settings.

Best regards.

Hi danielphillips86,

Glad to help you out.

If you like our plugin and support we'd greatly appreciate it if you could take a minute and leave a review on CodeCanyon on this link. It means a lot to us. Thanks.

Best regards.