nRF Connect for Desktop doesn't show anything

I followed the document and downloaded nRF Connect for Desktop in Ubuntu 18.04.5.

Then I changed the permission of nrfconnect-3.11.1-x86_64.appimage to "allow executing files as program", and tried to run it.

But nRF Connect for Desktop didn't show anything as the picture shows above.

How can I fix this?

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