Hi Engin, 

We can help you with some Custom CSS, but can you please send me an URL of your Page where the Table is, then i can try to devise some CSS?

If the page has any sensitive data, just mark the reply as PRIVATE for safety.

Thank you.

Hi Engin, 

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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I came up with some Custom CSS which can help you reduce that Gap on your Table :

.wpdt-c.wdt-skin-aqua .wpDataTablesFilter .wpDataTableFilterSection:not(#wdt-clear-filters-button-block):not(#wdt-pf-search-filters-button-block) {
    
    margin-bottom: -50px !important;

}
.wpdt-c.wdt-skin-aqua .wpDataTablesWrapper div.dt-buttons {
    
    margin-bottom: -34px;
}
.wpdt-c.wdt-skin-aqua .wpDataTablesWrapper .dataTables_length {
    position: relative;
    bottom: 9px !important;
}

This is the end result if you add it :

You can change the margin-bottom or the "bottom" value for each Element to change/move them around until you get the best design you wish for your use-case.

If you want this style only for one Table, add it to this Table's Customize/Custom CSS;

Or if you want the same style for all tables, add it in the Main Plugin settings/Custom JS and CSS/Custom CSS.

I hope that helps.