Typically data sets are oriented to have more rows than columns as it's easier to read. Currently in the cube viewer having the chart take-up the bottom half of the screen means that parts of the data-table are quite often cut-off from view.

This problem would be solved by optionally allowing the splitter to take an vertical orientation, putting the chart on the RHS of screen. Allowing the data-table to extend to the bottom of screen.

In such a mode the default chart would be a horizontal bar type.