1.1 When you right click on your source and choice Git Gui but you can't see git gui screen
2.1 Goto and open file: YourProject/.git/config
2.2 Change
......
[gui]
wmstate = normal
geometry = 1924x1030+-2399+1 625 655
=> CHANGE
sd geometry = 893x435+234+234 175 196
2.3 Close old Git Gui and reopen it