Vouching
Use vouches to mark reviewed support and collapse stable parts of a graph.
Most arguments are longer than a single step. Once a reader has checked an earlier part of the graph, they may not want to spend attention on that same support every time they return to the argument.
Here, the first inference is relatively straightforward: the inspection found rotted boards, and rotted support boards create a pedestrian safety risk. The second inference is more contestable because it depends on a stronger policy judgment about immediate closure.
If you have reviewed the support for L1 and think it is acceptable, you can vouch for L1. Vouching is a way of saying that, from your perspective, the reasoning up to that point has already been checked.
In the View settings, you can choose to hide vouched areas of the graph. That keeps the vouched statement visible, but collapses the support beneath it so the reader can focus on the unresolved or more controversial part of the argument.
Vouching is useful because it reduces repeated work. You can mark the parts of an argument that you have already reviewed, then spend more attention on the parts that remain uncertain, controversial, or personally important.
Vouches also become a signal to other readers. If many people have vouched for a part of the graph, that does not make it automatically correct, but it does suggest that the area has been reviewed and may be comparatively stable. A part of the graph with few or no vouches may deserve closer inspection.