Printing full page when in Landscape

Hi, I’m new to Omniplan. When printing to either A3 or A4 and turn the settings to Landscape the project does not fill the page even when scaled to fit paper, i’m used to asta whereby when you select the date range and print to scale it scales the gantt chart and fills the page, Omniplan seems to only print on half the page in landscape. Not sure what i’m ding wrong.