Hello Markus

This can be changed with some custom CSS.

Can you please provide me the URL for the page, where I can see this behavior, and I'll gladly take a look, and share the needed CSS with you?

Thanks Markus!

Here you go:

a.dt-button {
width: auto !important;
}
.wpdt-c.wdt-skin-aqua .wpDataTablesWrapper .DTTT_button.DTTT_button_export {
width: 118px !important;
}

Please try this, and let me know if it works correctly.