Hidden subflow after import

General
1

I imported this example flow, which contains a subflow, but the subflow does not appear in the palette. The result is that I cannot delete it. I can see that it is there in the flows file. I have tried restarting node-red and flushing the browser cache.

Welcome to Node-RED
===================
25 May 14:15:30 - [info] Node-RED version: v1.0.6
25 May 14:15:30 - [info] Node.js  version: v12.16.3
25 May 14:15:30 - [info] Linux 5.3.0-53-generic x64 LE
25 May 14:15:30 - [info] Loading palette nodes
25 May 14:15:31 - [info] Worldmap version 2.3.10
25 May 14:15:31 - [info] Dashboard version 2.22.0 started at /ui
25 May 14:15:31 - [info] Settings file  : /home/colinl/.node-red/settings.js
25 May 14:15:31 - [info] HTTP Static    : /home/colinl/.node-red/static
25 May 14:15:31 - [info] Context store  : 'memoryOnly' [module=memory]
25 May 14:15:31 - [info] Context store  : 'file' [module=localfilesystem]
25 May 14:15:31 - [info] User directory : /home/colinl/.node-red
25 May 14:15:31 - [warn] Projects disabled : editorTheme.projects.enabled=false
25 May 14:15:31 - [info] Flows file     : /home/colinl/.node-red/flows_tigger.json
25 May 14:15:31 - [info] Server now running at http://127.0.0.1:1880/
25 May 14:15:31 - [info] Starting flows
25 May 14:15:31 - [info] Started flows
2

The subflow is in the omnik category.

3

Oh, so it is. That is confusing, to me anyway. I didn't know you could assign a subflow to a category, but now I see you can. In case anyone is looking for where to do this, it is in the Appearance tab of the subflow properties.
Thanks.