Many canoes here, in canoe country of the Canadian Shield, have a seat with a lowered front edge. This is meant so a paddler can either sit in the seat. or slide off and kneel in front of it when going gets rough. He can lean his butt back against the low, rounded front edge of the seat for a while, then slip (or, in my case, groan) his way back onto the seat.
One caveat - do NOT - repeat - do NOT stick your feet back under the seat. This is the kiss of death in case of capsize. You may well not ever get your feet out from under the seat of an inverted canoe.
Don't worry, though, an hour later, or a few days later, someone will get your boat out of the water and remove your feet from under the seat for you. By that time, you will never notice it.