Is it possible to present a legent on graph in two+ columns? I have a chart setup in such way that it would be more easily to read if the legend is split in two or more columns (number of legend items is 100+)
Which platform are you using? In Graph Builder and some other platforms, the legend does split into multiple columns automatically. Other platforms may have different behavior for the legend, which may or may not support customization.
With Fit Y by X I assume you are using the Row Legend to create the legend. Unfortunately this legend is essentially a Table Box with a single column, which does not have an option to wrap. I tried doing it another way - adding two legends and then removing some of the rows through scripting, but this does not leave the legend in a usable state. The number of rows in the column has to equal the number of rows in the table.