Hi, John

Thanks for reaching out to us

I experimented with some styles, and not sure if this will resolve exactly what you need in this use-case,

but it seems it Is working when i click on the table tool, or if i force an "active state",

for example for the Column List button,

can you try to add this,  either to the table Custom CSS,   or as Custom CSS of the WP page?

a:active.dt-button.buttons-collection.buttons-colvis.DTTT_button.DTTT_button_colvis {
    border-bottom: 1px solid red !important;
    border-bottom-width: 1px !important;
    border-bottom-style: solid !important;
    border-bottom-color: red !important;
}

Let me know if that helped?

Thank you

Hi, John

Sorry for my late reply

Thank you very much for the video that showed more details about what you're trying to do.

Now I can see exactly what you mean.

I was not aware of this particular CSS from our table skin, to be honest.

We will reach out to our senior 2nd level Team,  and we will show them all the details, as well as the Stack Overflow post,

and we will report back as soon as they advise what will be the best approach to tackle this.

Thank you for your patience.

Hi, John 

Thank you for your patience.

We still don't have an update, but i am checking with our 2nd level, and will keep you posted on this matter.

Thanks

Hi, John

We have been advised by our senior Team, thank you for your patience once again.

What you can do as a "temporary" solution, for the time being, you can edit our plugin's stylesheet file, located in :

../wp-content/plugins/wpdatatables/assets/css/wdt-skins/

find file aqua.css  there and you can remove the "!important"  clause from there,

and we will pass this as a feedback to our developers, they will do their best to work on removing that "!important" clause in the future.