The repeater regions are covered in Zanthors sticky guide.

click on your chracter set name and you will see a third option = In-gamme ISboxer GUI hotkey. Set a key combination. I use ctrl+alt+\

Once in game press the combo, and a menu box pops up.

in the first drop down select all other
then click add

A region appears that you can resize and reposition.

Once happy, click saveas auto ( whatever the default is)

Rinse repeat on all toons.

[The repeater region can is set up in game]