Hello Jeffrey,
The booking form can be customized via custom CSS, e.g. the following one:
.mphb_widget_search-check-in-date, .mphb_widget_search-check-out-date {
width: 45%;
float: left;
}
.mphb_widget_search-check-out-date {
margin-left: 10px;
}
.widget.widget_mphb_search_availability_widget form .mphb_widget_search-submit-button-wrapper input {
width: 100%;
}
If you provide me with an example URL, I will gladly take a look at it and provide specific styles to convert booking form to vertical layout.
Regards,
Andre