Would be great if there was a feature to select the lowest level of the row hierarchy you want to expand on.

So if you had a row hierarchy consisting of Country -> Product Category -> Product -> Product Configuration, you could select Product Category and have all rows at Product and Product Configuration be collapsed, while all rows at or above are expanded.

This would be massively helpful when you have a lot of rows, as the current solution with Save Layout would be time-consuming in this case.