Under the "Flange Length" option with "Blind" selected, it seems like the dimension and dimension type categories are arbitrarily created. When they are there, I can make the flange less than 90°, but if they aren't there I can't make the flange less than 90° (only between 90° and 180°).
Why is this?
Can I change something in a flange feature that doesn't have these options so that it does have them so I can make angles less than 90°?
Example showing a flange with the options and one without the options: