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An in-store method that works well if you live in area were reuseable bags are common is to get reuseable bags that have a removeable bottom. Plastic is best. You can find these in packs online. You use the bags instead of a basket get some items, ideally your most expensive ones and put them in the bottom of the bag. Then put the plastic on top, and get some cheap items that take up a lot of space like bread, chips, bottled water.
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and place the large item on the ground beside the scales

Do you mean the scales where we weigh the items before scanning them, or the ones where we put the items after scanning?

For example, in my country we have one on the left so we can weigh items that are sold without their own packaging, e.g. bread, fruit, etc., and then we have another one on the right so we can put the scanned items there so they can check if there's any discrepancy between the weight and the scanned item, etc.

There is usually somewhere where you can set your basket down that does not have a scale. One can set their bag of groceries down there and take items out of it to scan.

You can see it here on top of the fridge: