How do i switch between gta v and gta online on the same console?

The only verified source supplied is a Wikipedia article about Grand Theft Auto Online, which describes its release dates, platform availability, and basic gameplay features. It does not mention any mechanism for switching between the single‑player mode of Grand Theft Auto V and the multiplayer mode of Grand Theft Auto Online. Because the evidence does not cover this question, I cannot provide a definitive answer based on verified facts.