WASHINGTON — At John Fetterman’s desk in the Senate chamber, there is a newly installed monitor that rises or lowers, depending on whether he sits or stands, and provides closed captioning so he can follow the proceedings. At the center dais, a custom desk stand has been built to accommodate the same technology for when he takes his shifts presiding over the Senate. The sergeant-at-arms has arranged for live audio-to-text transcription for the committees on which Fetterman serves, and plans to expand the service to all Senate hearings. But his adjustment to serving in the Senate has been made vastly...