We use the publisher to lay out final presentations, in this specific case there are 5 DIN A0 boards side by side.The only way up to now is to create a large page with the width of 5x DIN A0 and divide it into 5. When exporting, however, the content must be copied to a single DIN A0 format. In InDesign any number of pages can also be arranged side by side and not just one below the other.
I hope Affinity will soon fix this problem.
For Architects it is necessary to arrange several pages in a row!