We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 23.0.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in update.
Or get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html
Illustrator TeamErik commented
After expanding a greyscale traced artwork, the edit colors window causes Illustrator to freeze. Sometimes directly upon starting the Edit colors... window and sometimes after choosing a different color scheme. So in essence the same as others have reported.