Highlight Active-Selected Diagram

We believe we have this functionality as show in following screenshot, where selected active diagram is Highlighted:

Please let us know if we missing anything or share screenshot of the situation you facing.

I like to use white theme and at least in my pc using chrome look my screenshot...

In your screenshot, the "active diagram" (which is Diagram_3) is selected diagram, and that is correct behavior.

Please explain, if we are something.

What I proposed is, if it is possible, the selected tab-diagram be more highlighted, bold the title or change the background of tab, in order to be more clear which tab is active.

Thank you.

That is good point, I will discuss that with our designer.

Thanks