This led me to some unknown places, so thank you 😉
First, select your axis by clicking on it; then look for the Label â–¶ Text Pattern property to set your custom pattern. Click on the ellipsis to open the editor; basically you select Argument, then one of the prebuilt formats, and you can then manually customize it simply by typing in the central area.
The result can be seen below (hopefully - I know it's a bit small).
This worked perfect and got me exactly what we needed, thank you very much! Very interesting feature to remember for future graphs as well. Happy to also bring you to new places in OneStream, we all learn something new every day! 😊
