I hope the mods will allow a very brief off-topic detour. On the matter of IKEA, I would like to know why you can't turn around and go back the way you came. It sounds like you can't but I cannot figure out why. What's stopping you? (I've never been in one.)
I'm not sure what you mean ... the IKEAs I've been in have a big maze-like showroom where you walk by lots of "rooms" of furniture, which then leads you to the warehouse/shopping area. I don't know why you couldn't turn around and leave if you chose to. There's usually a shortcut if you don't want to walk through the showroom.
Amara, you can walk the other way but there's no point to it. Think of the store as being laid out horseshoe shaped on two floors, with no short link on the top floor between the horseshoe ends. I came in on the ground floor of the left hand end. I had to go up to the top floor for kitchenware - that's where the 'rooms' are - and walk all the way to the other end of the horseshoe which is where kitchenware is. At that other end, there are stairs down, but there's no till, and there's no entrance or exit to the outside. I went down and then walked all the horseshoe back again through the flatpack warehouse to the tills, which are under the way-in stairs and go out through a different door. You can't get to the tills from the way-in stairs, there's a barrier. You can go just through the ground floor warehouse/tills bit without going upstairs, if you know what you want, although you still have to walk one horseshoe because it's closed off so that on the ground floor you can't get into the left hand end of the horseshoe, you go along a corridor to the other end, but the kitchen stuff is only available upstairs.
It's quite deliberate so that you go past everything, but I agree with whoever said to pick the visit time carefully. I went during the football world cup, and there was only me and one other couple there, I think. That was lovely. Their stuff is generally excellent and the prices are good, but they keep costs down by having very little by way of service.