Known as mandela effect many people experience changes in their past, this is ramping up. There you see timeline changes in effect, where different parallel timelines will melt, so as result people with different past live together. Within a molten timeline the collective consciousness define what will appear when looking into the past.
But physical witness does not change, if someone have an artifact from his timeline the others are able to see and touch it. Past insights that will be created at sight behave the known quantum physics effect, that the viewers or collective consciousness create it from known patterns.
Looking forward is easier to explain, here you see the possible timelines, new will appear and old will fade out if the collective have changed the path. It require strength to switch over to a path against the mass of people around you, so most time all will experience the same. Here is also the point, where your elites manipulate your consciousness to create their outcome.