That's the neat part of agile / scrum / whatever at larger companies, they don't actually change priorities much from one sprint to the next unless there's a major external factor like an outage. Larger companies like to be able to look ahead, at least a quarter but ideally a year or more.

At my current contract we use "SAFe", "scaled agile framework" which basically revolves around quarterly plannings, but above that is a long term planning of course. (energy industry, scale of hundreds of engineers)