There are a large number of user-settable parameters that affect the program operation. The Options Dialog can be brought up from the Options menu, or by clicking the Options button near the bottom of the screen, or by touching the 'O' key.
In general, if a passage is being displayed on the screen at the time one or more options are altered, the passage will be immediately re-analyzed and redisplayed using the new option.
The Options Dialog has five tabs at the top that group the options by function: