I drop the loader's cutting edge is down (dump position, but maybe not full dump). This allows the bucket to drain, if there is still remnants of snow on the surfaces
The three point is also down.
I rarely leave anything raised, by the way. To me, that's a safety issue. The loader would eventually leak down anyway...
I leave the tractor in gear (manual transmission). I'll use the parking brake if I'm stopped and the engine is idling, but when I shut down, the tractor is left in gear. FYI, the 790's must be in neutral to start the engine.