Hi, Terry.

Sorry for the late reply.

It should be working, i just tried with the latest version on my table.

Did you make sure to input the correct table ID, in this CSS?

#wdt-table-title-68 {
    font-size: 30px !important;
}

On my example, this table ID is 68, and it works on my page.

I tried both adding custom CSS directly to the WordPress page,  and also if i add the CSS in the table's back end settings in our plugin,  in Customize/Custom CSS;

both methods apply it correctly.

Let me know if that solves the issue?

But if not, and If you already checked the table ID in the CSS, you might have an issue on your site specifically.

I can take a remote look.

If you could send me an URL to this table's page , and WP-Admin access.

Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.