As from the documentation of /set feedback in jshell, there are following built-in modes:
verbose, normal, concise, and silent
Is it possible to create a feedback mode with the functionality of both concise and silent? Or we can change any one of the above mode? Or can we create our own custom feedback mode?
You can create your own custom feedback mode using the command:
/set mode <your-mode-name> -command|-quiet
where the -command option indicates that you want command feedback. If you don't want commands to describe the action that occurred, then use -quiet instead of -command.
If you want to copy an existing mode, you can do that as:
/set mode <your-mode-name> <existing-mode-name> -command|-quiet
For example
/set mode samplemode concise -command
In order to merge the functionality of both, you might have to edit the attributes from the command line for one that you didn't initially copy from.
来源：https://stackoverflow.com/questions/47903508/create-custom-feedback-mode-in-jshell