In comparison to the equation editor, the response area window is fixed regarding its size.
This sometimes complicates work and reduces use of ease.
The picture shows the response area of the question type matching. The question type is not relevant here.
It is not possible to adjust the window size, it is fixed.
For question authoring it would be easier for authors if the size of the reply window could be changed.
If you use the equation editor (question authoring), the window size is changeable.
Can you explain what you would like to see resizable? Students should be able to resize their assignment as they wish.
You won't be notified about changes to this idea.