@JoAnne65 Cashiers do tend to leave their registers and go to a different part of the shop now and then, but always return when you click on the register and select for your sim to buy something. There is nothing new about that, but when you build a mall, the entire mall becomes the space they're allowed to wander around in while waiting for customers.
I built a mall for Hylewood, a tiny island with less than 20 lots, none of them being very large either. I wanted all rabbitholes and all of the non-rabbithole community lots I send my sims to regularly, and the only way to accomplish that was to make a few very multi-purpose community lots. The first one I made was a 23x22 lot I designated as a library and named public services. Besides for the library, I built a small graveyard and a playground, and a small building with a restroom and stairs going underground, where I placed the Lunar Lakes rabbithole portals for the school, stadium, city hall, police, and military.
On a 20x30 lot at the edge of the island below the water, I built a lot designated as an art gallery, named the Waterfront. Besides that library, it has a small non-rabbithole cafe with a food register and a barista bar.
My mall is on the largest lot in Hylewood, 40x40. At first I designated it as a big park, but when I tested it, I found that stylists and tattoo artists won't be assigned unless the lot is designated as a salon, so I changed it. The front 2/3 of the lot is the central park, with a long, narrow, three story building along the back of the lot, containing the mall. In the mall are a gym with a pool, a bowling alley, salon, consignment shop, martial arts academy, and a recreation center. Underground are the rest of the rabbitholes, mostly the Lunar Lakes portals, with the smallest science center in the library, which happens to also be the hospital. The cashiers, stylists, and tattoo artist even go to the basement level in this one. So if I send my sims to the consignment shop, they might have a long wait for the consignment specialist to show up, though when I was playing there, my artist never did have to wait to consign her paintings.
I do have pictures of all three lots, which I can post if anybody wants to see them, though they're not nearly so elaborate as your mall's shops.