If your site has Logo/Site Title - Button only, no navigation. You can use this code (Website > Website Tools > Custom CSS) to to hide burger and make button appears on mobile.
@media screen and (max-width:991px) {
.header-actions.header-actions--right, .header-actions-action--cta {
display: flex !important;
}
.header-burger {
display: none !important;
}
.header-display-mobile {
flex-direction: row-reverse;
}
.header-title-logo a, .header-title-logo a img {
max-height: 40px !important;
}
}