"Diagram" tab / button disappeared the latest version 5.8.0.8?

Hi community

Just to check if you could find the "Diagram" tab / button in the latest version 5.8.0.8?
It is one of my favourite functions in EM.
Any one could help?
Thanks!

Latest version:

Here is an snapshot of older version:

Please have a look at the release notes. They are very important and contain all changes:

Thank you Jochen!

To be frank I love the old UI, this new UI seems a bit hidden.

Any chance to add an icon of Diagram into Design tab?