Hi Derek,
If you have trouble selecting an entry from a pull-down
menu in afni or suma, right-click on the text to the left
of the menu. That will open up a scrollable popup menu.
For example, right-click over "Cmp" for the colormap
selection menu.
This applies to basically any such menu (that has the
little rectangle on the right side of the menu area, e.g.
just to the right of NN in the "Col" menu, above).
- rick