You can Force the CTA Button to be displayed in the mobile menu near the hamburger toggle by adding this code to Theme Options / Custom CSS
@media (max-width: 1025px){
.uicore-header-wrapper .uicore-extra, .uicore-navbar .uicore-nav-menu {
display: block!important;
}
.uicore-navbar .uicore-nav-menu .uicore-nav {
display: none!important;
}
.uicore-nav-menu .uicore-extra a.uicore-btn {
margin-left: auto;
}
}