I used to be part of a club for early morning swimming, which worked well and there was always plenty of space (when it got a bit busy so sharing lanes was needed, people followed good etiquette generally with only 1 twat who everyone knew to leave him to himself).
Nowadays, I can't do that club anymore, but have been trying to get back swimming as a fat, late 40s, with bad back problems, and sedentary office job and my commuting walk for exercise gone due to Covid....woman. Luckily there are adult only sessions with lanes which are generally quiet in the local LA pool, but there are usually a number of much older ladies pootling along in the casual lane (making good steady progress but slow) and very fast guys in fast crawl lane - so I go for the middle lane at a reasonable paced, steady breaststroke with some crawl thrown in. There's 1 guy who tries to hog the middle rather than the anti-clockwise system, and I have had a whack on my head a couple of times - despite letting him past in the middle or giving him space ahead of me at the ends when he does catch up on me (I tend to get 3 lanes in to his 4 - whereas I would pass all 4 in the casual lane each length...). The open area has people not lane swimming but doing physio type exercises, disabled people going in but needing to stay near the edge, older people in for a float and gentle swim but not looking for full lengths etc. So I think I am in the right spot, and there are only 2 of us there mostly.
Either that, or I need to get up at stupid o'clock and do the very early morning sessions again....