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Can I zoom into the page size while viewing the PDF file?

Yes, you have the option to change the zoom of the page according to your need. At the top right there is a Zoom dropdown that has ‘Page Width’ selected by default. Click on it to adjust the page zoom and get a closer look at the details.

Also, at the top left of the comment panel is a ‘toggle sidebar’ button. Clicking the button opens the slide panel at the left containing thumbnails of all the PDF pages in the document.