Sometimes, when in a work environment, you may be put into a group chat so you can speak to your coworkers easier and at the same time, in case you are not always at work at the same time. If you need to leave a group chat, let the group know why you have to leave before leaving. Be sure to speak in a respectful and proper tone so that evey one understands why you need to leave. If you plan on returning to the group chat, let them know how long you will be gone so they can expect your input again as soon as you return.