You can add a star to a message, for example to mark this message as important, or to provide yourself with a reminder to view or answer this message later. 


You can add a star to a message by swiping it to the left (on Android) or right (on iOS). 

An overview of all starred messages is shown by clicking the dropdown icon in the menu, and clicking Starred.


 You can remove the star by swiping it again.