Increase the size of the fonts in the 
Floor
Plan pane. The size of table and seat fonts can be set separately.
Move the tables closer together in the Floor
Plan pane. This will make them appear bigger when scaled to
fit the page.
Set the Floor
Plan pane to display seat numbers, instead of names, by
selecting Seat reference
from the Guest name
drop-down. Set the 
Table
Chart pane to display seat numbers as well as names. Print
out both Floor
Plan and Table
Chart panes. The floor plan can then be cross-referenced
against the table chart.
Export the floor plan as a image and ask a someone with a larger format (e.g. A3 or A2) printer to print it for you. Check export/copy image as large as possible in the Preferences window to increase the resolution of the image. Set export/copy image margin to 0% in the Preferences window to reduce the unused area. If you want to print it at high resolution you should also consider exporting it as a vector (SVG) image or as a PDF.
Export the floor plan as an image and read it into an application that can print across multiple pages (see Print a multi-page floor plan in Paint).
Print each table on a separate page from the 
Table
plan pane.
Order a bespoke large-format plan online from one of our partners.