Using a custom HACS front end card not working?

I’ve not been able to get custom cards working. I must be missing an obvious step. As an example, trying to add shutter card. I believe I successfully downloaded it via HACS:

But when I try to do a custom YAML card, it says it can’t find that custom element:

Did you restart home assistant? Some HACS things need this…

Yes, didn’t change anything.

Have you cleaned up a browser cache?

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That was it, thanks.

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Then mark this thread as solved to show other users how to solve the issue.
Tick my post as a “solution”.