I'm sure this can be done, just cant figure out how. I'm needing to export my portfolio as a pdf but my indesign document is a3, i see no option to chose the size.
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A workaround is to take your A3 indesign document and place it inside an A4 document.
Alternatively, you can export the A3 document as an A3 PDF and insert this at stage 3.
You can press Page tool (Shift+P), which is normally the third icon under the white arrow into the Tool Bar. Make sure that all the layers into the document are unlocked, then in the Liquid Page Rule press Scale, then press Ctrl+A to select the pages and give the size of A4. It automatically scale the content to A4.