[Freesurfer] panning Freeview on MacBook Pro

Hi,

How do I pan on Freeview on a Mac please? Mine is an El Capitan, MacBook Pro (Early 2011).

On https://surfer.nmr.mgh.harvard.edu/fswiki/FreeviewGuide/FreeviewGeneralUsage... it reads: You can pan across the data, which is especially useful when zoomed in. To do so while in Navigate mode navigate.gif , Voxel Edit mode voxel_edit.gif , or Recon Edit mode recon_edit.gif click and hold the scroll button on the mouse while moving the image. Alternatively, you can use the arrow keys on the keyboard. When using the arrow keys, know that when you scroll up, down, right or left, the actual label moves around, not the screen.

I have tried the touchpad, with and without cmd, alt, fn, shift, ctrl... Also tried the arrow keys.

Thanks, mary