Sorry for the late reply and thank you for the video! I can see that in the status bar of Fiddler it says 'Capturing' which means that your system proxy settings point to Fiddler. This means that if you set your browser's proxy to use the system proxy settings, you should see the traffic being captured by Fiddler.
However, the log message, which you provided, mentions that the system proxy settings were changed, which means that they do not point to Fiddler anymore:
20:50:44:7894 WinINET Registry change detected. Verifying proxy keys are intact...
20:50:44:7899 WinINET API indicates that Fiddler is no longer attached.
I believe that when Fiddler reported that, you saw a yellow button on top of it saying: 'The system proxy was changed. Click to reenable capturing.'
This means that maybe you have a program which is changing the system proxy settings like zScaler, for example. Please, try to stop the other program which is changing your system proxy settings, as well, or reconfigure it to use Fiddler as a proxy, which by default listens on 127.0.0.1:8888
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