Hi @suleiry m thanks for posting! That's a good question you can adjust your canvas to the required size using the Document Settings Menu. From there you should be able to adjust the canvas size - for example selecting A4 size. 

Alternatively you can adjust the download settings when exporting your document to PDF or printing. For more information I recommend taking a look at this Help Center article about exporting and printing. 

Hope this helps. Feel free to let me know if you have any additional questions about this!