Hi @diesveld.joep,
Thanks for asking about this option. It has already been requested before (in the Feature requests category) by another user: Extra option for page layout (66×33 instead of 33×66)
But since you ask I will spill the beans: this has been implemented and will soon be released. Depending on the level of your subscription that may be next month or the month after.
Hope it’s worth the wait 