OK I see what is happening here. This app is a visualization and not an "app" - so it should remain with "Visibility" = false.
Instead you first need to do a search, for example:
index=_internal | timechart span=1m count as count
| eval regions = "normal=#99D18B,5000,Warning=#FCB64E,7000,Error=#B50101"
Then click the "visualizations" tab, and select "region chart viz". Once done you can open the "formatting options" menu and if you go to the "help" tab, there will be a link to more examples.
Hope this helps and good luck 🙂
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