Is this a bug or desired behavior?
Best answer by Erik Brink
For both the Windows and Web GUI our 3th party components do not support this combination of features together. Technically, the columns are spread over two areas, fixed and non fixed, making it very hard to group them also.
Maybe you could group grid rows based on the columns you prefer to show fixed in the grid? This creates kind of the same effect. Of course your data in these columns should be suited for that and not a unique combination of values per data row.
Kind regards, Erik