Glad I'm not the only one who finds the drivers seat in the Leaf very uncomfortable by default.
Most of you seem to be talking about USA spec cars (including electric seats ?!) so I'm not sure how similar they are to the seats we get in UK versions of the Leaf...
I have a 2016 30kWh Tekna which is the top spec sold in the UK with heated leather seats however they are only manually operated so they only have three adjustments - forwards backwards for the base, up/down for the base and backrest tilt.
For me after analysing it there are a number of significant design flaws with these seats that cause me great discomfort unless I add some padding and a seat cover.
1) The side bolsters on the base are too close together, especially towards the back, and too hard/pointy. As a result instead of being there to prevent me sliding sideways I'm sitting on top of the tips of the bolsters and they dig into my bum/thighs uncomfortably. This means most of my weight is carried by these pressure points on the side and little in the middle area of the seat.
Further - when the seats get older the bolster on the door side of the seat seems to weaken and lose it's stiffness first (probably from people swinging around to get out putting all their weight on that bolster) meaning that when you are sitting propped up by these bolsters one side is lower than the other - for me this causes hip pain.
2) While there is some back rake on the base (tilting back of the base by raising the front) it is not enough for me meaning that all my weight is carried on the bum and none by the thighs which are up in the air. Raising the seat doesn't help either because like many manual seats with a height adjustment the mechanism raises the rear of the seat more than the front, so as you raise the height the back tilt is reduced making the situation worse not better. Apart from being uncomfortable this can lead to "submarining" where there is a tendency for your bum to slide forward in the seat which leads to worse posture.
3) The seats are just too hard. They're certainly way harder than the Leather seats in my old ICE car.
To make the drivers seat bearable I've had to cut a section of foam Yoga mat out to sit in the middle area of the seat but not going all the way up the bolsters to make the seat a bit flatter so my weight isn't carried by the tips of the bolsters, and then a seat cover over that to keep it still.
This is a really badly designed seat and I'm surprised that it hasn't been updated over the years.