I think this can be done. You can compare with this oob table on form activity.list.g, which is shown in Incident's Activities tab. Check if you have set "Column Headings" for the table in fd. Refer to screen copy:
Cheers :) Yan Tong (Serene), HP Software Support If you find that this or any post resolves your issue, please be sure to mark it as an accepted solution; and give kudo if you like it :)
The previous suggestion just displays column headers in the table (as opposed to not displaying them at all). But there is no capability to have column headers hover over the table as you scroll through the record list.