Hi,
There is no "hide" option for clef and key signature.
If space is an issue, you can try "massaging" some of the Format/Font settings (eg. sizes of various score elements), or use the Layout features to set up bar spacing, staves on the page, etc.
We have a number of tutorial videos that you may find helpful - please see our page at
http://www.notation.com/TutorialVideos.php for help, or use Help -> Users Guide to go to the documentation where you can find step-by-step instructions for a number of tasks. You can use the Index to look up what you need to know how to do.
Or you can always post files and ask questions here on the User Forum
ttfn,
Sherry