One-sided
Some people try to maintain control (or the illusion of it) by dominating conversations. They speak in such a way that leaves little room for others to contribute.
These occasions are sometimes called “one-sided conversations” but it’s a bit of a misnomer.
The other side of the conversation happens indeed — in the mind of the stifled participant.
Opposite the incessant speaker is the listener’s internal monologue, and it’s firing away ... regardless of whether one can get a word in.