SYMPTOM:
When displaying a prompt window, the number of elements displaying can be set at the attribute and project level in Strategy Developer 10.x, as shown below:

CAUSE:
This is by design, the number of elements displayed can be set both at the project and attribute level.
ACTION:
In order to set the number of elements displayed in the prompt window at the attribute level, follow the steps below:

In order to set the number of elements displayed in the prompt window at the project level, follow the steps below:
