Hi and, first of all, thank you for your feedback!
As UI/UX can sometimes be subjective and hard to get right for everyone, it would be great to get more concrete information what your users find difficult to deal with, so some concrete examples with screenshots would be great 
Additionally, could you give me some more information on the environment you’re using?
- screen resolution
- zoom settings
- language used
This information would really help us in determining the areas to improve. Thank you!
As stated in the following forum topic, we do plan to adapt the test runs page in the future - and I also stated some hints on how to better work with the current UI:
Best regards,
Alex