You can't.
I'm not sure how you would want that to work. Say you have a nice
report that fits on letter-size paper. You then want to print it at a
larger font. Presumably it would not fit on the paper anymore.
You can export a report to PDF, and then use its viewer's zoom options
to zoom in on a part of the report.
Of course you can design the report with a larger font to begin with.
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