A method is performed at a computing system including: a first housing that includes a primary display, and a second housing at least partially containing (i) a physical keyboard and (ii) a touch-sensitive secondary display (TSSD) distinct from the primary display. The method includes: receiving a request to open a file associated with a content-editing application. The method further includes, in response to receiving the request: displaying, on the primary display, content from the file within the content-editing application; and also displaying, on the TSSD, a user interface including multiple user interface elements each associated with a content-display parameter for modifying presentation of content within the content-editing application.