How to Concatenate parent node with all children node

[daniel-ign]

I am new to this and im trying to align the expanded parent nodes horizontally.

This would effective change the UI of the tree
The best example would be how VS Code has implemented it.

Where the parent is:

• in one line
• a concatenation of the sub-nodes that were selected

How is this done?

[daniel-ign]

Anyone?