How can I change the name of a Audio Mixer group?

Hi! I am using the Unity3d 5.5.0f3 personal.

After I opened a Audio Mixer window, I created a newAudioMixer. Then on the slot of “Group”, I clicked the “+”. The the “NewGroup” is created. But I can’t change the name of the “NewGroup”.

Even I right clicked on it “Rename”, nothing happened. I used my Mac and Laptop. They won’t work!

Please help me
Thank you!

There seems to be a bug with Unity 5.5 where you cannot rename the mixer groups until you go into play mode at least once during the session.

Just go into play mode then back out and you should be able to rename the groups whilst pressing F2 with them selected or right click them and select rename.