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Hi,

You can solve with a few css rules.

.top-menu[data-depth="1"] {
    display: flex;
    flex-wrap: wrap;
}

.top-menu .sub-menu ul[data-depth="1"]>li {
    flex: 0 0 33.33%;
    margin: 0;
    max-width: 33.33%;
}

Don't forget to clear the cache from prestashop and browser.