Hey @Aaron_Xu, thanks for flagging this to us!
The updated panels were intended to be tied to UI3. We’re still rolling this out slowly to the community, but in the interim, we’ve shipped a fix to ensure that you don’t see a mixed UI2/UI3 experience.
If you’re still seeing the mis-matched tab colors, please refresh and let us know if you continue to run into any further issues.
I’ve also merged your topic with another similar, existing one here in the community. We’ll continue to track this bug over there.