How to use Debugger with UNO?

Hi! I am a newer in Arduino ide 2.0 user and interested in the debug function. I have some questions about how can I use the debug function with Arduino UNO? Do I need other hardware except the UNO?

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What debug function are you referring to ?

I mean this

Everytime I click the debug button, the new file named launch.json jumps out. I don’t know what it is and if I need some new hardware like J link?

Not compatible with the Uno, according to the Arduino blog, the debugger is initially only usable on SAM D21 boards.

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Thanks! I get it

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