Family Historian User Group

A simulated chart is attached – names changed.
In one branch of my family, Grandmother Margaret ANDREWS, had “child 1”, by “Unidentified 1”, out of marriage. “Child 1” was adopted.
She was then happily married to Kenneth SMITH with whom she had two sons.
One of the sons marries Angela NOAKES, who had also had an out of marriage child by a previous relationship – “Unidentified 2” and “Child 2”. “Child 2” stays with her mother.
On generating an All Relatives plus Indirect Relatives Diagram (to show the two children) they are displayed differently. Unidentified 1/Child 1 are on the same line as the mother and her children (which I would expect and would prefer) whereas Unidentified 2/Child 2 are shown in a separate sub-tree below the main diagram.
How do I make the two apparently identical relationships show in the same way?
PS I’ve not been able to modify the diagram with the Move function!

The simple answer is that there is not enough room to show unidentified 2 and child 2 on the same line as Kenneth and Angela’s marriage, so FH duplicated the marriage on to the row below, and added the dotted line to show it has duplicated the marriage, so it had room to add unidentied 2 and child 2.
I’m no expert on diagrams, but think that adjusting page width might cure the problem, others no doubt will correct me if I’m wrong

If it helps, here's the gedcom file for this test chart.

In your example Angela is a spouse of the relative of the root of the diagram, so Child 2 is not a direct relation of the root, this means they will only show up using a separate tree as they are not related.

If the child belonged to Kenneth (1972) then they would be a descendant of the root so would show as the other child does.

If you root the diagram on Angela and Kenneth as a couple the tree will be more as you are asking. Another option is to add the child in question as a step child on the main Family of Angela and Kenneth as well as a child of Angela with the unknown person.