I made several printing tests with different settings. Finally, I think to have found a quite good setting but there is still an issue. I don't know why only one half of the model is printed. See picture attached showing some printing tests.
I checked the Y axis. The hotend can easily move from one end to the other on the gantry manually or using the "move option" on the touch screen.
I wonder if there is some mistake in the .gcode but I don't know how to check.
How can I fix this problem ?