I accidentally closed a custom activity before publishing it. How can I find it in my Custom Activities?
To test it, I just created a new custom activity and closed it without publishing. When I went back to Desmos and selected the Custom Activities from the left panel that new activity was right at the top, since it was most recent.
It looked just like the published ones on the list, but once I selected it, it allowed me to continue editing the unpublished draft.
If you have made more activities since, it won’t be on top but you should be able to look through the Custom Activities list and find it by name.