It is one of the key characteristics of Mastock to be highly customizable. Most of the users go through several phases of discovery; initially, nobody wants to go through the pain of setting up a program to make it work, everybody wants instant usability. This is why there is a default value for each of the parameters and you do not have to bother about it.
As time goes, we all want the program to go our own way. You can take time to discover each of the screens, each of the possible customizations and see what works for you.
Every color you see on the screen can be changed. Note that, when you have found the right combination for you, you can save it as a theme. Discover each screen at your own pace, each screen has its own dedicated Help.