This is a great article by Clarice, but i disagree with this one statement. Yes, the microphones will be shut off, but Trump and Biden are in the same room. Though it will not be heard over the air, brain addled Biden will hear Trump's voice. Trump will be able to kibitz and interrupt Biden, who, in his state of anger driven dementia, will babble incoherently to address Trump's interruptions. The public will hear only Biden's babbles.
The microphones of the candidates will be shut off, but the microphones of the "moderators" will not, and I expect the "moderators" to interrupt Trump repeatedly to make a "correction". They won't do that to Biden.
I think Biden will be angry and animated, and drugged but I also think he will be tightly scripted and constantly spewing well memorized portions of speeches he has given dozens of times. He will also be tossed softball questions his team has likely been given in advance so I think he will do OK and anything short of falling over will be adjudged a triumph by the media.
That said it is not a bad thing for Trump if Biden is given the win because we need to keep him on the Dem ticket. Trump might even consider taking a dive in this debate though that is not in his nature.