Factorio Forums

When the player clicks on one of the quickbar numbers to view the entire list, pressing one of the number keys should select that quickbar.

At the moment, when a player presses one of the number keys, it selects the item from the hotbar corresponding to the number.

When the quickbar list is closed, the players intention when pressing the number keys is to select an item, so this makes sense.
When the quickbar list is open, the players intention is to change the quickbar position/selection, so the number keys controlling this would be more intuitive.

SHIFT+number sets the top (active) quickbar, so you can do it that way although maybe not the first thing a player thinks of.

shift+number is definitely useful for changing the top bar, but this suggestion is more geared toward when you are trying to "manually" change any of the bottom 1-3 quick bars.