@fluffy I can confirm that the option is not present while on MacOS Sierra. Just noticed this as well (started using my Mac more often due to my recent night classes) and noticed the menu/dock was not darkened.
@cgm2016 you can uninstall by quitting f.lux (in the menu to the left of your system clock) and deleting the files. You may want to check if your MBP is one of the ones affected by a video driver problem, this isn't normal behavior with f.lux: www.macrumors.com/2015/02/19/2011-macbook-pro-repair-program-apple/