Hello Nikos

Thank you for your purchase.

At the moment, you can only choose which user roles will be able to interact with the table. Meaning, which roles will be able to add new, edit and delete rows.

You can, however, use this CSS to hide the table's "Add new" and "Delete" buttons from front-end, so they would only be able to edit the rows:

.DTTT_button_new {
display: none !important;
}

.DTTT_button_delete {
display: none !important;
}

You will also need to hide the "Apply and add new" button in the Edit modal:

.wdt-apply-edit-button {
display: none !important;
}

You can add this code in between the <style>...</style> tags on the page, before the wpDataTable shortcode.

Hope this helps.