HomeRunner has two calendar shortcodes, and the one you choose affects how readable the calendar is in a narrow sidebar column.
The [homerunner-availability-calendar id=N] shortcode shows two months side by side on screens wider than 768px and is designed for full-width sections. In a narrow column, its day cells and nightly prices are cramped.
The [homerunner-property-calendar id=N] shortcode shows one month at a time, with the nightly price under each open date and a See Price button that pre-fills the booking box with your guest’s chosen dates. Use this shortcode for sidebar columns around 450px wide.
Replace N with the listing’s HomeRunner property ID, which you can find under HomeRunner > Properties.