In my post, there’s a crop of your second screenshot. In the crop you can see a tiny speck center-bottom. I’m wondering if that’s the cluster of notes and you are just zoomed out really far.
No, not View -> Zoom In, just scroll with your mouse wheel or pinch-out with two fingers on the trackpad.
^here I’m using the mouse center wheel to zoom in-out in the Graph.
Here’s what I’ve done to get the graph in the defective obsidian vault to display.
Step #1
I created a new vault and copied the notes from the defective vault (ie, the one that shows a spec in the Graph View).
So I have two vaults with the names:
Obsidian Vault (which displays a spec that I have not successfully enlarged).
Obsidian Vault Test (which contains a copy of the four note files: Start Note, A, B, C).
Step #2
I examined the hidden .obsidian folder at the top level of each vault and found the .obsidian.graph.json file.
Step #3
I compared the two .obsidian.graph.json files to discover any differences.
Two JSON properties caught my attention in the .obsidian.graph.json files.
scale
close
The tiny spec had a very small scale. It was "scale": 0.007824539369268026.
Step #4
I increased the scale value to "scale": 1.007824539369268026 and reopened the vault. The graph is now displayed.
Two more questions.
Is there an option, when the scale reaches an incredibly small scale, to set the zero before the decimal point to 1? That’s what made the graph become visible for me. The option name might be Reset Graph Scale to 1. Other users might appreciate this option when the scale becomes too small. I didn’t see the spec until you pointed it out to me.
Also, what is the purpose of the JSON close property?