If you are using custom menu plugin in place of theme default, make sure to check responsive menu if needs to make it available for the particular plugin rather than theme default select menu.

Add following in your custom CSS.
Either use ‘Custom CSS’ tab of Theme Options or custom.css of child theme.
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@media (min-width: 768px) and (max-width: 991px) {
#sticky-menu, .sf-menu, .sf-sub-indicator { display:block; }
.slicknav_menu { display:none; }
}

@media (max-width: 767px) {
#sticky-menu, .sf-menu, .sf-sub-indicator { display:block; }
.slicknav_menu { display:none; }
}