The parameter to adjust is "Opening Width in 2D". Rather than specifying the angle of the panels... you specify the width of the open space left by the folded door... and the angles take care of themselves. A little weird, but works.
You can adjust this parameter visually with the editable hotspot (red diamond hotspot in screenshot) in your 2D view... dragging the door open until you like the look, or entering the width. Or you can edit the parameter in the object settings. Screenshots attached.
Note that as with other doors, there is a separate setting for the opening in 3D.
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