We noticed this last week too. We have a couple of adjustments in our admin > admin.css theme file to the layout, but for us adding this code snippet has worked as a temporary fix until a new version is released:
/* ACF UI Fix */
.acf-fc-popup ul {
flex-direction: row !important;
}
.acf-fc-popup ul li {
margin-bottom: 20px;
height: auto !important;
}
/* End ACF UI Fix */
