How to integrate a decent serial monitor?

An serial monitor/terminal with arrow-up for previous commands, and local echo that can be enabled. - basically any terminal program from the 80’s had that.
minicom can do the job just fine, but how to make it properly replace the built-in serial monitor?

You can’t replace the builtin monitor.

But you can use other VS Code Plugins like Serial Monitor or use external programs like putty.

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Thank you, this is much better, but there is no way of using it as default? (as after uploading firmware?)

Afaik: no.

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