Stellarium popup: Configuration -> Extras

Information settings that can be toggled are:

• Use unit of measuremenat mag/arcsec² fur surface brighness
• Use short notation for unit of measurement of surface brightness
• Use formatting output for coordinates and time
• Use designations for celestial coordinate systems

Additional buttons that can be shown or hidden are:

• Constellation boundaries button
• Astermism lines button
• Astermism labels button
• Ecliptic grid button (there does not seem to be a default keyboard shortcut to show the ecliptic grid)
• ICRS grid button
• Galactic grid button
• Centering button
• Nightmode button
• Nebula background button
• Flib buttons
• DSS button
• HiPS button
• Bookmarks button
• Fullscreen button
• Quit button
• Buttons background

These buttons are shown when the mouse is moved toward the bottom of the GUI of Stellarium.

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Stellarium popup: Configuration