Keyboard shortcuts

The keys and mouse controls of the viewer, as Help > Shortcuts lists them. Ctrl is Cmd on macOS. A key acts on the selected view, the one last clicked, and works only when that view is one of those listed.

Keys

Keys	Action	Selected view
A	Fill the window with the axial view, or show all four views	any
C	Fill the window with the coronal view, or show all four views	any
S	Fill the window with the sagittal view, or show all four views	any
3	Fill the window with the 3D view, or show all four views	any
Up	Next slice	2D views
Down	Previous slice	2D views
Right	Next volume of the selected 4D image, or of the main volume	any
Left	Previous volume of the selected 4D image, or of the main volume	any
Ctrl++, Ctrl+=	Zoom in	any
Ctrl+-	Zoom out	any
R	Show the whole view again (zoom 1, centred)	any
I	Show or hide the text, labels and colour bars over the views	any
X	Show or hide the crosshair	any
Shift+A	Look at the 3D view from above	any
Shift+C	Look at the 3D view from the front	any
Shift+S	Look at the 3D view from the side	any
Shift+R	Reset the 3D camera	any
Ctrl+O	Open files	any
Ctrl+Shift+O	Open a saved session, replacing what is shown	any
Ctrl+S	Save the items and the views as a session	any
Ctrl+1	Show or hide the Layers panel	any
Ctrl+2	Show or hide the Options panel	any
Ctrl+3	Show or hide the Labels panel (the labels drawn in 3D)	any
Ctrl+4, F	Show or hide the Inspect FOD panel (the selected FOD at the crosshair, large)	any
Ctrl+Shift+S	Show or hide the Screenshots panel (views saved as images or a video)	any
Ctrl+,	Show or hide the Settings panel	any
F1	Show or hide the Help panel (the guides)	any
Ctrl+0	Hide all the panels, or show again the ones hidden	any
Ctrl+Q	Quit	any

Mouse and trackpad

Mouse	Action	Views
Click	Select the view and move the crosshair there	2D views
Drag	Move the crosshair	2D views
Scroll	Next or previous slice	2D views
Ctrl + scroll, or pinch	Zoom about the pointer	2D views
Ctrl + drag	Pan	2D views
Drag	Turn the scene	3D
Scroll, or pinch	Zoom	3D