Size of Summary Graphs Shown on Teacher's Dashboard

Loving the article on summary graphs in the Computation Layer Monthly

I’ve been trying it out with this GCSE Maths Diagnostic Test

However I was wondering how much of the graph would show up on the Teacher’s Dashboard so I can size the summary appropriately.

Here’s a screenshot of the teacher’s summary
Summary Graph Teacher's View

Which is cropped from a student’s view of the same summary

Is there any guidance in the documentation about this?
Any other feedback on the activity always welcome