Space between main menu items

does something like this work

.x-navbar .desktop .x-nav>li {
    float: left;
padding-right:1.5em;
}

*is this your parent theme’s support area?*
https://themeforest.net/item/x-the-theme/5871901/support

Check the font settings first:
https://theme.co/docs/typography

Otherwise you can use this under font-family:

.x-navbar .desktop .x-nav>li {
    float: left;
    padding-right: 1.5em;
    font-family: none;
    font-size: 16px;
    color: #333333;
    text-transform: uppercase;
}