In the lower right hand corner of each set (Definitions, Antonyms, and Synonyms), there is a "Choose a Study Mode" drop down box. Play around with all of the different options. Also, don't forget that the settings can be adjusted by clicking on the white wheel (just above the drop down box).
Flocabulary Unit 8: They Look Like Us: Definitions
Flocabulary Unit 8: They Look Like Us: Antonyms
Flocabulary Unit 8: They Look Like Us: Synonyms