Talking about mobile client here.

Is there any way to see how much progress the Merc has? If you click on the xp bar the Merc gets the XP and the training stops and starts again after a 20 second delay. Is there any possibility to see the progress in advance without stopping? On the other hand: I had the  xp bar im the TG filled by like 10 % before I clicked it. What is the percentage about? Time from max time? 

I tried to switch the trained Merc. Dragging a new one in results in "no free slots" message, but I couldn't dragg the training Merc back either. I had to stop it by clicking thr bar and could remove him during the delay. Is this the only way to do it?

Bug: you can select Mercs you don't own but are able to craft in the TG selection list. Dragging them onto a training slot will result in freezing the game.