Breath and pause markings are available in the Breaths & Pauses palette in the advanced workspace.
To add a breath or pause (the latter also called a caesura, or informally "tram lines" or "railroad tracks") to the score, use one of the following options:
The symbol is placed after the note.
To adjust the position of the breath or pause, use any of the following options:
From version 2.1 onwards, you can adjust the pause length (in seconds) of the added symbol using the "Breath" or "Caesura" category in the Inspector.