When I was choosing the color, the preview was supported
It suddenly doesnât work. Why is that?
With this tiny information, probably no one will be able to help. Best are screenshots and videos to see what could cause your issue. And more than two sentence 
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Thank you for your kind explanation.
It was a little difficult to express the problem I said.
But I found it!
When I checked âmaterial picker previewâ, color preview was activated.
Thank you!
Cool, didnât know that there is a tick for it. Thanks for sharing this! Itâs on per default I guess. Good you find a solution.