You have tried zooming in/out using pinch, or the zoom level options from the menu, right? You can also specify different terminal sizes in the session editor, look for "Terminal Size" after pressing the "Advanced" button.
Not sure if it fits here or should be a separate topic.
It would be nice to have a longer buffer in the terminal, in order to see longer folder listings, etc. Similar to the functionality of the "real" Mac os terminal.
This means also that if having a terminal size of a specified with one can scroll up and down without limitations.
To specify the terminal size, please go into the session editor, tap on the "Advanced" button at the top, then scroll down to reveal the "Terminal Size" field.