It is bleached by default. Because it is all purpose and for cakes and pastries bleached is better. Unbleached white all purpose flours range in color from almost white, slightly yellowish or creamy, all the way to dirty gray or quite brown, depends on wheat, so bleached is the default kind of flour, at least in Canada.
When flour is unbleached, it says unbleached on the bag and costs a bit more.
Check the ingredient list to see if it has any of these bleaching agents:
https://en.wikipedia.org/wiki/Flour_bleaching_agent
It is bleached by default. Because it is all purpose and for cakes and pastries bleached is better. Unbleached white all purpose flours range in color from almost white, slightly yellowish or creamy, all the way to dirty gray or quite brown, depends on wheat, so bleached is the default kind of flour, at least in Canada.
When flour is unbleached, it says unbleached on the bag and costs a bit more.
Quick google search answers the question