That cannot be done. There is no “page” setting.
The height cannot be controlled. It will use up as much vertical space as required to fit the text on the Card. And the height of all Cards in a Row will use the same height as the tallest Card. But the Task Editor Widget has a scrollbar, so this should not be an issue.
The Task Editor Widget has an option to control the Card width. The setting is Column Count, which when increased will shrink the width of Cards. But be aware, line-wrapping will occur if it cannot fit within the width, effectively making the Card taller.
It looks like you are not using the KD the way it was intended: 1 Order per Card.
Instead you are putting entire Tickets (multiple Orders) per Card, which is why they are so tall (and IMO is not appropriate for a Kitchen Display).
It’s ultimately up to you, but if your intention is to show all Orders on a Ticket on a single Card, then you could have used a Ticket Lister Widget instead - it was designed for that.