Variable Content AXELOR_HOME

The variable AXELOR_HOME, should be left in 2 lines, or in continuous line?

What do you mean ? It depends on the number of columns your terminal displays for a row !
Mine for my tests looks like
export AXELOR_HOME=/home/axelor-development-kit/build/install/axelor-development-kit;
Of course if my terminal has 10 cols, it will be displayed in multiple lines :o)