Lead Developer
You can increase the width of your sub-menu with this CSS:
.main-navigation ul ul {
width: 300px;
}Adding CSS: https://generatepress.com/knowledgebase/adding-css/
Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/
Ongoing Development: https://generatepress.com/ongoing-development