Hi Anton,
The space you see is from the padding applied to the off-canvas menu’s inner container plus the padding left of the menu items plus the padding right of the menu caret icons.
You can adjust these elements with CSS:
Try this:
nav#generate-slideout-menu .inside-navigation.grid-container.grid-parent {
padding-left: 0px;
padding-right: 0px;
}
nav#generate-slideout-menu .main-nav ul li a {
padding-left: 0px;
}
nav#generate-slideout-menu .menu-item-has-children .dropdown-menu-toggle {
padding-right: 0px;
}
Adjust the value to your preference.