There's no width option, but they're usually not that skinny. It can happen if you use the same variable for both X and Overlay. Or maybe if the X is continuous. Can you check those or share a little more about how you're creating the view?
X and overlay are different are different columns (names). X is nominal. it does not matter ix X is numeric or char. but X is nominal in this case. attached a sample data table. please run the script "Test" in data table.
Thanks for providing an example. With this sample data, there are a couple things going on. One is that there are a lot of potential box plots. There are 2 levels for P1 X 24 wafers X 13 lot IDs, so Graph Builder is allocating space for 624 box plots, which makes them skinny. However, a little less than half of those combinations contain data, so it only draws 290 box plots. That's still a lot, and I can see why they look too skinny since half the slots are empty. Looks like your data may have even more empty slots.
The only remedy I can think of is to create some synthetic variable that represents only non-empty combinations, such as the Wafer ID in lot ID column in the sample data does, but that may give up the consistent coloring.
Thanks for explaining.
and its kinda wiered the moment you add overlay option, box becomes skinny. :(. Thats only option for coloring boxes by "Split" to have some sort of legend option.