1. Reason: In VS Code, the green run button provided by the "Python" extension is to execute the command "Run Python File in Terminal". It only requires us to click once to run python files in the Terminal of VS Code:

   

   When we also use the extension "Code Runner", the run button ("Run Code") provided by it defaults to output results in "OUTPUT". In the previous use, this button will cover the green button provided by the "python" extension, but now that they are integrated, we can choose the execution method.

2. For setting "code-runner.runInTerminal": false, it determines whether the "code runner" runs in the "Terminal", the commands they execute are different:

   "Run Code"：python -u "/python_file.py"

   "Run Python File in Terminal": /python.exe /python_file.py

3. Solution: You could use F5 to debug the code or try to close the "Code Runner" extension. (Click "Enable" to restore the use of the extension.)

Reference: Run Python File in VS Code.