First 2:
Green play button, not faded.
Flow enabled, and is able to run, by for example pressing the play icon or from favorite flows.
Middle 2:
Grey play button, not faded.
Flow enabled, and is not able to run by pressing the play icon, because the flow needs/uses a value of the trigger card.
Last 2:
Green play button, faded to 50% opacity.
Flow (trigger) disabled, and is able to run, by for example pressing the play icon or from favorite flows.
And 1 more situation not shown:
Gray play button, faded to 50% opacity.
Flow (trigger) disabled, and is not able to run by pressing the play icon, because the flow needs/uses a value of the trigger card.