Hi,
I'm assuming you are using fixtures with subfixtures. If you add the main fixture to the matrix, it will be as a snake/row/column. You can also add the subfixtures instead of the main fixture, this way you can arrange them to your liking (takes a bit more calculating power for CueluxPro then if you add the main fixture)
To move the pixels around you can use the arrow keys on the keyboard, press P for 'Snap to Previous', press M for 'Move', press S for 'Set'.
These are all buttons on the right side as well.
I am not sure what you mean with pickup on the grip of the fixture... Can you explain a bit?
Greetings,
Bootsy