This is an "is it everyone or just me" situation - and I think we need to ask folks who are newer to CiviCRM. But personally, I don't use the "Preview" link on the Custom Field Groups, but I *do* use "Settings". It's pretty quick to flip them, so mainly looking for UX feedback. @bgm Do you have the ability to grep the web server logs for Spark over a long enough time period to see which link is used more by Spark users? More broadly - I think it's worth discussing Spark as a platform for collecting anonymized user behavior data (with consent and transparency obviously).