With the mark tool, we are able to manipulate not only the size of a letter. We can also flip any letter or word through the X or Y axis.
To accomplish this,enter the Mark mode by pressing in the left bar:
Using one of the select tools we need to select any letter we like. In this sample we will select the letter "r" in "ThreadsES"
Once the letter is selected, just right click on the letter. A menu will popup.
Hovering over the MIRROR option, a sub menu will popup enabling you to rotate the letter through the X or Y axis.