In Excel 365 (version 1908), I want to group columns using the Data -> Outline -> Group function. This works fine, but it only groups columns to the right. However, I want to group the columns to the left. In Excel 2013, I could define the grouping behavior by clicking on the little arrow on the bottom right side of the Outline section in the ribbon. In Excel 365, this icon is greyed out. How can I enable this feature?
This basically also applies to grouping rows to top vs. bottom.
