Ok, take this to a Private Chat and invite me or send me screenshots 
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I did not know about this feature, thanks for sharing.
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You can also view what mode was the merc used for if you go to the full merc board and tap on each individual hero
Documentation is not “Spoon Feeding” the users. Especially for beginners, about 2/3 of the information needed to play the game is documented IN the game. The rest has to be sifted from online sources. I do not come into a new game wanting to “poke around” to get things done. Video tutorials are nice, but they cannot be replayed. What is required is an old fashioned text manual that covers everything!
That was four months ago. The user you replied to left ages ago. 
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I did not know that
I replied because of the lack of documentation. And, having screen specific help is good. But why not a separate area with ALL the help, so the player can explore.
The quality of documentation is best measured by the complete novice. Everything about playing the game. Forums should be for playing well.