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Illustrator 23 crashed four times by creating a new color swatch... had open a illustration from adobe stock (102kb)...and wanted to create new color swatches...
There's a thread about fixing crashes
Here's what I would try first.
If it's just this document that does it (it doesn't happen anywhere else?)
Then File>Save As and choose .AI and resave the file - see if the issue persists.
If it does - then try
If all is failing then please try the first link I posted above with troubleshooting steps.