I just found this columns ACF add-on https://wordpress.org/plugins/acf-columns/ and it would be great if the ACF core had something similar.
Thanks.
Yes, I can use groups, but for very simple things, a column layout will work way simpler and cleaner as it would not interfere with the data – no need to create subfields and be forced to use long arrays just because you wanted two columns on the backend. It will have almost the same purpose as the tabs. The problem with the tabs is that they can’t be nested.