Jump to Scale up A4 to A3 - Scale up A4 to A3 as you print. Choose File > Print. Use your default printer (Black2Sided) or choose a different print type. Click Printer Properties. Choose the Effects tab. Select Print document on: Click the arrow next to A4 and choose A3. Ensure Scale to fit is selected. Click g: latex | Must include: latex. Sep 14, - 2 Changing paper setup mid-document; 3 Setting print size Plain TeX and LaTeX were primarily developed in the US. . A4 paper on A4 print paper for normal work flow, and A4 paper on A3 print paper for the final proofs.