Once you've got groups populated in the Group Settings tab of the Google Sheet, using the native filters functionality in Sheets can be a very powerful way to isolate groups of interest in order to determine exactly which groups require action.
Once you've got a single edit made to one of the groups you want to modify, you can easily copy-paste values down one or more columns of filtered groups in order to bring all groups into a uniform settings state.
Once you've got some settings modified, navigate to the Push updates to server tab.
Not sure what a given setting means in the Groups interface? Click on any field group color and it will pull up the relevant section in the Help Guide tab. Here you can learn how each Groups Settings API value translates to the UI.
Clicking Preview in the sidebar will load a full preview of edits to be made to the selected groups.
Toggling the switch allows you to view changes at the single group level, where you can progress through the groups with Prev and Next buttons.
Clicking RUN BULK ACTIONS will initiate the update. Check the update status column in the sheet to see whether all changes were successfully applied.