In order to detangle graph layouts, Bolt 2 will provide the option to map the control flow to the vertical axis, while keeping the value flow on the horizontal axis.

• The option for flow axis will be stored at the Graph level
• Existing graphs will preserve their horizontal flow
• New graphs will use vertical flow by default (configurable as an editor preference)
• Flow axis can be changed at any time, but it’s up to the user to rearrange their layout accordingly

The new vertical control ports will display slightly differently:

• Vertical control ports will be shown outside the node box
• Their arrow will point downwards
• No icon will be displayed
• Label font size will be a bit smaller to minimize horizontal space
• Hidden labels will remain hidden