Topping lift is the correct term. You could remove it entirely from the boom and secure it, for instance, on the rail, or you may be able to ease it enough so that it doesn't interfere with the mainsheet when you trim. On long passages (more than a day) they are often removed so they don't chafe the main, though if you need to tuck in a reef you'll need to remember to reattach it before easing the main halyard.
s/v casa chica
S&S Swan 43
Keep the boat IN the water,
keep the water OUT of the boat.