Press CTR + C to end your server on the terminal and copy and paste this in the terminal to run Flask again
FLASK_DEBUG=1 flask run
This will set Debug mode: on
To set variable in powershell -
$env:FLASK_DEBUG=1
No! You have not run your app in debug mode.
app.run(debug=True)
This way any changes in your code will restart the server and your code changes will reflect pretty much in real time.