The allegedly deliberate attack, which police said was not terror-related, happened after lunchtime on Friday.
Suspect Dimitrious Gargasoulas, 26, was released by a bail justice against the wishes of police five days earlier.
Victorian Premier Daniel Andrews said a new Night Court will be set up for magistrates to hear bail requests.
Thalia Hakin, 10, Matthew Si, 33, and Jess Mudie, 22, died in the attack. A three-month-old boy and a 25-year-old man, who have not been named, were also among the victims.
