There is a guy that has been spamming the hub chat and there is no way of stopping him.I had to mute the client from sending notifications. At least let us leave the hub there is no current way of leaving a hub.Please change that in your next client update. Edit: my bad i didnt see it. There is actually a mute button
Just for future reference, in case someone runs into a similar issue:
Move your mouse cursor over a little arrow next to the name of the hub and click it. It is marked with a red circle in the picture below.
You will see a box and you will be able to choose whether you want to just mute notifications or leave the hub entirely. It is marked with a red rectangle in the picture below.