super slim
Zen MBB Master
The handle bar stem is adjustable, and the same as mine on my Softrider V1.0.
If you gently lift up the two black stickers there is a pivot locking bolt under them, so loosen it off and also loosen the ratchet locking bolt in the front of the stem (see photos)
now adjust the stem angle down until your thighs just don't touch the handle bars.
You could try moving the seat base forward more, so the seat back angle can be reduced, but only if the BB does not get to low that the bottom of your thighs press against the front of the seat base.
If you gently lift up the two black stickers there is a pivot locking bolt under them, so loosen it off and also loosen the ratchet locking bolt in the front of the stem (see photos)
now adjust the stem angle down until your thighs just don't touch the handle bars.
You could try moving the seat base forward more, so the seat back angle can be reduced, but only if the BB does not get to low that the bottom of your thighs press against the front of the seat base.