Thanks for your reply! In the meantime I found a similar solution by addressing specific pages in css. But instead of hiding the columns in css, I did use your shortcode and adjusted the colors per column in css.
I found a simple solution in CSS:
.tablepress-id-5 td:nth-child(1) {
position: sticky;
left: 0;
}
.tablepress-id-5 td:nth-child(1) {
background-color: #FFFFFF;
}
I know already it’s because of the merged cells…
