If you have installed MySQL Workbench on your device (Windows/Mac) and you see the message "could not detect any MySQL server running" that means that the MySQL Server is not running or it has not been installed.
Case 1: If MySQL Server is not installeded
First thing you can do is try to run the MySQL command in the Terminal and check if it is installed on your device.
on macOS
% mysql --version
zsh: command not found: mysql
If MySQL is not installed, then you can get it installed using the homebrew package manager.
As you can see, I have started the MySQL Database.
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