To
Click
insert a New text
New Text
turn on a mode so you can manually insert a Zero-width space character (ZWSP) between words in a text that normally does not have word breaks,
Click Inserts Invisible Space (Baseline tab only). When turned on, your mouse pointer becomes 
.
To turn this mode off:
-
Press Esc.
-
Click anywhere outside of the Baseline tab.
-
Hide invisible spaces (View menu).
let FLEx guess word breaks in a text,
Guess Word Breaks
insert word glosses into a Free or Lit line that is empty and has the focus (you clicked the line),
Word Glosses
insert a Literal Translation (Lit)line,
Literal Translation
insert Note line,
Note
import a word set,
Import Word Set