how to break long flow to new line?

[nonkr]

If the flow step is very long in one direction, how to make it break it into multiple lines.
like

to

[elzup]

layout, (dimension, column) is not supported
Many issues have been posted

Alternative
split steps and use subflow

flowchart LR
	direction LR
	g1-->g2
	subgraph g1
		direction TB
		a1-->a2
    end
	subgraph g2
	    a3-->a4
    end

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