When there are large parking lots, there are multiple cart return areas scattered throughout the lot. Otherwise things would be really inefficient, to an even more nightmarish (and money-costing) degree.
Not sure if you're from the US, but the problem is objectively not as bad here as people say. If you look at various Walmarts (usually these are reliably some of the worst parking lots in any given area) in Google Maps (switch to satellite view) the reality is that the vast majority of people here actually do return their carts properly.
America is very big and diverse, and local culture varies wildly. You can go to a Whole Foods store in one part of a city and almost everyone returns their carts there, and then you can go to a Walmart in another part of the city and it looks like something out of a zombie movie, with carts and trash littering the parking lot.
Not sure if you're from the US, but the problem is objectively not as bad here as people say. If you look at various Walmarts (usually these are reliably some of the worst parking lots in any given area) in Google Maps (switch to satellite view) the reality is that the vast majority of people here actually do return their carts properly.
https://maps.app.goo.gl/uWE4wfydda7KtT2W8
https://maps.app.goo.gl/rCBrJKebU33rMq8J6
https://maps.app.goo.gl/5o4GksqTGahBkU816
The last one is by far the worst one I found.