Set your status to Do not disturb

1. Select your profile picture or initials in the upper right.

2. Select your current status under your name.

3. Choose  Do not disturb.​​​​​

4. Set a  Duration if you want. 

To turn DND off, repeat these steps but choose something else, like  Available. 

Tip: You can type /dnd in the top search box to set Do not disturb status.