Active Tab color highlighted
Answered
Where does this active tab color accent get set? Is it possible to change this?

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Unfortunately, it can't be changed. Please vote for https://youtrack.jetbrains.com/issue/IDEA-126775 to increase its priority and be notified about updates. Please also check this thread: https://devnet.jetbrains.com/message/5532304#5532304 - you might find the suggestions helpful.