When you have a lot of columns on your board, you have to horizontally scroll to reach them.
Currently you achieve this by moving your mouse pointer to the borders of the window (it's the default browser comportment). It's really not convenient.
A better way would be to allow a panning comportment to scroll horizontally, as it is the case in Trello : you would click-hold and drag your mouse anywhere on the board to scroll your board horizontally.
When you have a lot of columns on your board, you have to horizontally scroll to reach them.
Currently you achieve this by moving your mouse pointer to the borders of the window (it's the default browser comportment). It's really not convenient.
A better way would be to allow a panning comportment to scroll horizontally, as it is the case in Trello : you would click-hold and drag your mouse anywhere on the board to scroll your board horizontally.