Hello everybody!
When I visualize the board for the first time, when entering Trello, all the lists are side by side. (see figure A board not splited)

I would like to work with the board with all my lists side by side but when I edit something, including a card for exemple, it splits automatically into a two line board like this (figure B, board splited with two lines)

A long time a go I used to work it like figure A, but now, I looked every where to configure it to stay with the lists side by side but cannot find where I can change it...
Can someone help me please?
Best regards!