When viewing a PDF in CoLab, you'll find the PDF navigation toolbar at the bottom of the viewer area to help you navigate the PDF.
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The 2D viewer toolbar is divided into three sections: Navigate, Zoom and View. Via this toolbar, you have access the following PDF viewing features.

Opens the side panel, where you can navigate PDFs using page thumbnails, bookmarks, and a table of contents.

Opens the search panel. Search entire PDF documents using whole word and/or case sensitivity.

Allows you to highlight text to copy and paste it.

Allows you to move the document around on the screen. Hold down your left mouse button on the document and move the document.

Click this option to take you one page back in your PDF file.

Click this option to take you one page ahead in your PDF file.

Type a page number in the text field, and press the enter key on your keyboard, to jump to that page.

Zooms the view out moving the PDF view further away.

Zooms the view in magnifying the PDF.

Shows the current zoom level and allows you to select pre-determined zoom levels including 'Fit-to-page' and 'Fit-to-screen'.

This is a predetermined zoom option that scales the current page so its full visible in the viewer.

Allows you to select a portion of a PDF to focus on by drawing a rectangle around it.

Allows you to compare two revisions of the same PDF.

Use these buttons to rotate the PDF clockwise or counterclockwise.