How do I adust the speed that my Longmill moves when doing the outline or moving from one cut to another?
Outline uses G0 rapid movements, so that speed is determined by your firmware EEPROM - specifically $110, $111, $112 for each specific axis.
I’m not 100% sure what you mean by “moving from one cut to another” - if you mean while running a toolpath, that is handled by the set feedrate in the toolpath itself. You should be able to adjust the feedrate real time using the feed controls that appear while running a job if you need to speed it up slightly or slow it down slightly for different material types. Past that, the feedrate would have been configured when the design was turned into gcode.