Add feature that allows users to adjust size, (enlarge/ increase width), of document preview box/ window.

Also ensure uniform behaviour of preview screen for documents of types pdf, doc, docx, xlsx, ppt etc.

These feature would be very useful for users who either have small screens or those that prefer to read the document from the document preview window without having to first download the file. It also limits users having to scroll between multiple forms especially when doing approvals.