Bee,
On an iPhone, open the group.
At the bottom of the screen, there is a More menu (horizontal lines).
Click to open the menu.?
Scroll down to Settings - way down! Click on it. You get Settings and three other tabs (Default Sub Settings, Cover Photo, Member Notices).
Frances
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/g/GroupManagersForum/wiki
/static/helpMore help: use the search button at the top of the Messages list.