I need a grid that has grouping set by default in groupSettings and has no group drop area and no ability for a user to change the grouping.
Setting allowGrouping to false would seem to be the way. According to the docs it...
Gets or sets a value that indicates whether to enable dynamic grouping behaviour. Grouping can be done by drag on drop desired columns to grid’s GroupDropArea
But if I set allowGrouping to false, groupSettings won't work.