Side tab placement matters because it needs to match how the binder will be opened, read, and referenced. Side tabs are commonly the right fit for standard portrait binders, where users flip from left to right and need quick access along the edge. A tab in the wrong position can make the binder feel awkward in daily use, even when the letters themselves are correct. Buyers should also think about whether sheet protectors, covers, or oversized inserts will hide part of the tab edge once the binder is assembled. A divider that looks correct on its own can lose visibility after the full binder is built if tab position was not considered at the start.