ASKER
A miscellany is defined as a "collection of various pieces of writing by different authors", but it has come to mean something "Of items gathered or considered together of various types or from different sources" or "a collection or group composed of members or elements of different kinds". The word "miscellaneous" comes from the Latin word "miscere", meaning "to mix." You might have heard the expression "a mixed bag," which applies when you don't quite know what you're going to get. More commonly, a miscellaneous group is made up of an odd group of things that don't fit anywhere else.
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You listed Android as a topic so I'm guessing its only text messages on Android phones you're concerned about.
AFAIK there is not way to remove members of a text message group. You will have to create a new group without that person(s) in it. Even adding person to a group only creates a new group text, and they cannot view previous messages that were sent.
If you wanted some of that flexibility you'd need to use chat app like WhatsApp to on the fly add and remove users.
Hope this helps,
Martin