Solution 1:
In > System Preferences > General, set "Show scroll bars" to "When scrolling" (or, if you're not using a mouse, "Automatically based on mouse or trackpad"). The scroll bars will be hidden unless you scroll the document.
In > System Preferences > General, set "Show scroll bars" to "When scrolling" (or, if you're not using a mouse, "Automatically based on mouse or trackpad"). The scroll bars will be hidden unless you scroll the document.