Each Field has a heading option, which you could use, but I think maybe you have many such ‘groups’ in a single field, which may not work.

Are you able to send me a live link/URL to your search page so I can take a look?

Please note that we are now closed for the day as it is gone 5PM here in the UK. For any further replies, I will be back on again tomorrow.

So, for example, you would want to split the Download Tags up into separate sections. Is it likely that a document could have tags from more than one section? Or, indeed, they would have a tag from every section?

This would need to be inside some responsive media query so it only applies to desktop?

.entry-content .searchandfilter[data-sf-form-id="598"] li.sf-field-taxonomy-download_tag > ul {
    columns: 3;
}
.entry-content .searchandfilter[data-sf-form-id="598"] li.sf-field-taxonomy-download_tag > ul > li {
    margin-bottom: 0;
}