- Click on the “Customize” link in the top black bar.

- After the new panel is fully loaded, scroll down until you see the last option “Custom CSS” and click the arrow at the right.

Paste the code in the last line and then click on the button at the top “Publish”.

Code: #
#main-nav li:not(.themify-widget-menu) > ul {
left: 0;
right: auto;
}