Its known issue, Sql Developer cant find javahome. So to fix this, put your javahome
SetJavaHome /Library/Java/JavaVirtualMachines/jdk1.8.0_261.jdk/Contents/Home
in your product.conf file:
/Users/<username>/.sqldeveloper/product.conf
You can find your java home path, by
ls -ls /Library/Java/JavaVirtualMachines/
Officially supported java 8,11, but also works fine with 14