Here is the procedure I used with my Zorro S 3.11.2 installation for the Z12+ strategy.

1. Open the z.ini file that is in the Strategy folder. Please note this file name has a lower-case z.
2. Change MaxCapital to whatever you want. I did MaxCapital = 50000 (Starting value of an FXCM demo account).
3. Save the file as Z12+.ini to match the file name of the strategy. DO NOT just overwrite the old z.ini file and mind the capital Z and the + sign at the end.
4. Start Zorro and wait for the price data to be downloaded from the broker. Note that now the Capital slider has a maximum value of 50000.

Please note that sliding Capital to 50000 gets reset to 4000 during the download period, at least for Z12+ My understanding is that this is baked into the strategy in order to protect the capital available. Zorro will not just go and spend the 50000 immediately. How much it will invest in any particular trade is determined by the Z12+ algorithm.

I noticed that sliding Capital to 50000 AFTER downloading ends "sticks" until you restart Zorro. However, I am not sure of the effect of this, since it seems the algorithm (not the user) determines how much risk is taken etc.

Hope this helps!