Don't be nervous, it was honestly not as difficult as I envisioned it would be. Everyone including the interviewers were very supportive throughout the process.
My group interview was with two faculty members and a total of 8 prospective students. They start out by giving an overview of the program and then everyone has a chance to introduce themselves.
Then they move onto unique individual questions where you have 2 mins to respond to a question they put on the screen. The questions were typical interview/social work questions, such as: how do you envision SW to play a role in urban communities, how do you envision technology playing a role in SW, describe a time you were given constructive criticism and how did you apply it, (there were a couple more than I can't remember).
Afterwards is the group activity. The interviewers turn off their camera and give the group a task to complete in 5 mins. Everyone was really supportive in my group and made sure everyone had an opportunity to speak. (Time goes by really quickly during this portion) After the 5 mins, you debrief the activity with the interviewers and share your thoughts on the experience.
The interview concludes with them giving you a writing prompt to respond to via email within 10 minutes. It's a simple prompt asking you general questions about your plans to manage the demands of the program.
I hope this helps you feel less nervous! Something that helped me out is having a glass of water nearby to take a sip every once in a while. Remember that they gave you an interview for a reason. You got this