here's an earlier comment of mine about the topic

> Just checked this. It seems both cmd+sidearrow and alt+sidearrow (on a mac) are bound to cursive's structural editing move forward and move backward actions out of the box. As I use cmd+arrow for those, I unbound alt+arrow and it now works the way you describe

From this thread https://clojurians.slack.com/archives/C0744GXCJ/p1610431219018800

Thanks @U08BJGV6E and @UCCHXTXV4