When editing a document in Compass, clicking the “+” add-field button beside a field opens a dropdown menu. In cases like the root _id field, this menu only contains a single action (for example, “Add field after _id”), so the user has to click twice to perform the only available action.

Update the behavior so that:

• If the add-field menu would contain exactly one action, clicking the “+” immediately executes that action without showing the dropdown.

• If the context supports multiple actions (for example, arrays where we show “Add item to <field>” and “Add field after <field>”), the existing dropdown behavior is preserved.
• Visual affordances (hover states, focus, etc.) remain consistent with current patterns.

Reference: https://mongodb.slack.com/archives/GDTJXPHD0/p1775571784979799