The "Preferences" drop-down allows one to choose day-time or night-time modes, as well as whether to disable the tool-tips when one hovers over a button.
[[Image:filterwheel2a.png|leftnone|300px|The preferences drop-down]]
More detail on the boxes in the filter wheel GUI interfaces for each filter wheel
[[Image:filterwheel3a.png|leftnone|200px|Detail on the filter wheel GUI]]
Note: the filter name and colour are obtained from a configuration