Preventive measure without the right to bail for a suspect

I read that in Lviv, a man suspected of murdering a serviceman was ordered by the court to be held in custody for 60 days without the right to bail, although his lawyer requested house arrest, pointing out that he has a permanent residence and cares for his grandmother. Please explain in which cases a court can deny the right to post bail to change the preventive measure, and what grounds are considered for this?