Stacking cards in a player hand

When I send cards to a Player Hand I cannot get them to stack - the cards automatically line up alongside each other - the only way I am able to stack the cards is to disable stacking - but then the mouse over stack viewer does not work (because they are not really stacked) so the cards under the top one cannot be seen without moving them.

Am I missing a setting? What am I doing wrong?

Your using a Player Hand - not a private window.

From the help files:

The main difference between a Player Hand and a normal Private Window is that in a Player Hand, the contents are automatically laid out in a row instead of stacking like counters.

Many thanks for this. My bad for not reading the documentation properly.