test-kivy-app/kivy_venv/lib/python3.11/site-packages/kivymd/uix/dropdownitem/dropdownitem.kv

<MDDropDownItem>
    size_hint: None, None
    size:
        (self._size[0] + dp(12), self._size[1] + dp(8)) \
        if self._size else \
        (0, 0)
    md_bg_color: "red"

    canvas:
        Color:
            group: "drop-down-item-color"
        Rectangle:
            group: "drop-down-item-text"
            texture:
                self._drop_down_text.texture \
                if self._drop_down_text else \
                None
            size:
                self._drop_down_text.texture_size \
                if self._drop_down_text else \
                (0, 0)
            pos:
                self.x, self.y + dp(8)
        Color:
            group: "drop-down-item-triangle-color"
        Triangle:
            points:
                [ \
                self.right + dp(0), self.y + dp(12), \
                self.right - dp(6), self.y + dp(12), \
                self.right - dp(6), self.y + root.height - dp(3) \
                ]

    MDDivider:
        size_hint_x: None
        width: root._size[0] + dp(14) if root._size else 0


<MDDropDownItemText>
    size_hint_x: None
    width: self.texture_size[0]
    adaptive_width: True
    role: "small"