The old days of desktop or laptop computers being the prevalent way to access the web have gone, and most sites now need to work equally well on both small and large screens. Vertical menus do not work well on mobile phones!
Simple Responsive Menu is a quick and easy way to make your vertical menu responsive.
I did have a problem setting it up, even after following the instructions that you can download with the module, but the support team responded within a few hours and helped solve the problem.
I ended up uninstalling and then reinstalling the module, and now it works perfectly.
Thanks for a great, easy to use and configure modules, and an extended thank you for the technical support.