How to rotate the sub menu arrow when open

Max Mega Menu includes a built in option to rotate the arrow when a sub menu is open. Go to Mega Menu > Menu Themes > General Settings and enable the “Rotate” option under “Arrows”.

Rotate option under Arrows on the General Settings tab of the theme editor

If you would prefer to swap the “down” arrow for an “up” arrow when a sub menu is open, go to Mega Menu > Menu Themes, choose your active theme and add the following to the Custom Styling tab: