If a cut is not good (the end of a word is missing for instance), you can straighten it to retrieve just the part of the word that you have cut by mistake.
•To straighten a cut, click on the cut mark (arrow pointing downward). This one turns to orange.
•Straighten your cut thanks to the following buttons :
to straighten the beginning of the cut (blue).
to straighten the end of the cut (yellow).