Hi there!

Thanks for your query.

You can use media query for that.

Here is sample custom CSS for you:

@media (max-width: 1024px){
#offcanvas-toggler {
display: flex !important;
}
.sp-megamenu-parent{
    display:none !important;
}
}

Please put the max-width value as per your need.

Note: Path towards custom CSS: Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

Best Regards