To rotate documents, hover over the vertical dots at the top of the page and select from the available rotation options.
Resize documents in the doc viewer
You'll use the Scale tool to resize documents in the document viewer.
To add the Scale tool, hover over the vertical dots at the top of the document viewer, then select Customize.
Next, select Scale from the list and choose its' position in the toolbar.
Click Save and Close.
Your scaling options will appear below the Scale icon: