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Ruler (Cmd-R) —  toggles the text ruler
Contents Card (Option-Cmd-Home) —  toggles Contents Card display
Navigation Bar —  toggles navigation bar display
Toolbar (Cmd /) —  toggles toolbar display
Customize Toolbar... —  reveals a sheet for configuring the toolbar

Creation Dates —  toggles creation dates display
Change Dates —  toggles change dates display
Due Dates —  toggles due dates display
Show Date and Time —  toggles display of dates and times in the dates column

Shapes —  toggles Shape display
Focus on Shapes (Option-Cmd-S) —  toggles direction of all mouse clicks and key presses to the Shape layer
Stickers —  toggles Sticker display
Keywords (Cmd-K) —  toggles Keyword display
Checkboxes —  toggles status checkbox display
Priorities —  toggles priority display
Notes Column (Control-Cmd-H) —  toggles Cornell Note Taking page notes column display

Zoom —  commands for changing the Notebook’s visual scale