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When creating inline records from the Calendar view, open the sidesheet immediately instead of having to click the arrow expand buttons to actually edit the record. IMO this should be the default interaction if no fields are editable from the interface page.
There's a small hiccup on in-line record creation on the Calendar view if no fields are visible. My users either get confused as to how to edit newly-created records or don't even realize that those arrows to expand records exist.
Regular feedback from users of Calendar interface views who express confusion resulting from this interaction. The calendar view is the favorite view from many of my users, but this interaction is a little janky.
I believe almost anybody who uses the Calendar view in interfaces would prefer this method of inline record creation if there are no editable fields.