Many word processors and other composition tools offer the chance to edit your document in a distraction-free mode, without the usual toolbars and other clutter.
If you prefer this way of working, you can do it easily in Google Docs / Google Drive. Simply open the View menu and select the Full Screen option. Everything but the body of your document will be hidden, leaving you to let rip your creativity without any distractions.
When you want to return to normal editing, just hit the Esc key.