Reporting Services: Tablix RepeatColumnHeaders doesn't work on some reports

Question

So I\'ve got various reports that consist of a DataSet rendered in a Tablix... pretty garden variety stuff. There is a property for the Tablix control named RepeatColumnHead

Answer 1

It's a bit wonky from what I've managed to dig up. In your grouping pane, select advanced mode, then select your outermost static row. You should then see the "RepeatOnNewPage" property.

Update: finding Advanced Mode:
The comment by @HCL links to the other answer by @user359904, that has the info on how to find and enter Advanced Mode:

1. Select the tablix
2. Below the report are "Row Groups" and "Column Groups", all the way to the right of "Column Groups" is a small downward arrow.
3. Click the arrow, choose Advanced Mode.