Close Ankicards, create new Ankicards is not possible

I can’t close Ankicards anymore and I can’t add new cards.
But it is still possible to learn with the old cards.
I already tried to turn of the computer, but Anki must be closed for that, and this is not possible.
I tried all buttons, but there is no reaction…
What can I do??
It interferes with my whole computer!

Kind regards Zoe

If an error has occurred, you may need to force-quit it. How to Force Quit Apps in Windows and macOS – The Florida Bar

Thanks!

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