Moving rows indicators

In a TAdvStringGrid, when one move a column, there is a indicator (two green arrows) showing where it was and where it will be moved if I release the mouse button. I have some grids where this indicator does not appear.

What are the properties that should be set to view this indicator?

There is no setting to turn this off, so it is unclear why you do not see this on some grids.
I'd suggest to compare properties / events handlers between grid where you see the arrows and the grids where not.