Hello,

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

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We do not have a built-in way to achieve that at the moment, you can only try with Custom CSS.

I tried some code, and this is the best i came up with :

input#wdt-table-title-edit {
    width: 1000px !important;
}

It is not perfect, because it looks a bit strange, it overlaps over the pencil icon :

You can use this Plugin to add CSS to your Back-end of WordPress https://wordpress.org/plugins/admin-css-mu/.

Let me know if that helps as a start, at least this way you can increase the Table Title width during editing on back-end,

and i will still ask our developers if we have any better way to achieve this at the moment.

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We will do our best to work up a better solution and i will report back as soon as we try more tests with custom CSS.

If you wish to see an easier user friendly way it the future,

Please feel free to search on our suggestions page, 

 to see if someone may be already suggested this feature. If you can't see it, feel free to add your suggestion there,  and as more people vote, the feature will move higher on the priority list.

You can certainly follow our changeLog page if you'd like ( it is also available in the plugin dashboard), where we state any changes/new features/bug fixes during updates;

and our newsletter, so you're informed about new features, bug fixes, freebies, etc.

Hello,

We have an update from our developers, they advised you can try this Custom CSS instead :

.wpdt-c .wdt-datatables-admin-wrap .wdt-table-name {
    max-width: 2000px !important;
    width: 1300px !important;
}

Same as we said before, in order to add this CSS to your back-end, you will probably need to use a 3rd Party Plugin such as Admin CSS MU.

And of course, you can change the max-width and width values to achieve your desired width of that element.

I hope that helps.