How to improve website
 

Please guys I have a problem and I wonder if anyone can help me ... I have zero knowledge of theme, plugins and wordpress. So please explain in details ..

I have problem with the menu of this site www.yourdentalsupply.com .. the shop menu is long and ugly just want to change it to wider menu which is divided into four columns or more

I tried the mega menu plugin but it mixed my theme up ..

I world really appreciate your help

If you have used the menu plugin for the site then check there might be some issue in that or you can change the menu plugin, there are many menu plugins available for wordpress, just go to the plugin option and search for the menu plugin.