Calendrier annuel

You could do that with custom print CSS. My Calendar has a default print CSS file, but it’s replaceable, so you could customize those styles to yield an A4 landscape layout.

You’d need to set some pre-conditions like:

@page {
  /* Sets the size to A4 and orientation to landscape */
  size: A4 landscape;
  
  /* Optional: Sets the margins for the printed page */
  margin: 10mm; 
}

.mc-main {
   // your styles here.
}

You’d place your custom mc-print.css file in your theme directory or in a custom plugin folder called my-calendar-custom, and it would replace the default CSS for the print view.