Using the Google Dev Tools I found the elements:
.palette-primary .navbar-default .navbar-toggle, .palette-primary
and constructed the following CSS code to make it more responsive:
@media (max-width: 768px) {
.palette-primary .navbar-default .navbar-toggle, .palette-primary {
display: flex !important;
flex-direction: column !important;
margin: auto !important;
}
}
You can use that to try and modify the CSS, however, making customizations to the theme through the CSS is not ideal and may be overwritten during updates to your theme. If that occurs you can simply reapply the CSS through the Editor.
I hope this helps!
Sincerely,
Carlos D