If you are one of these people who still has access to the higher energy processing centers, you can intentionally remember a version of the way things used to be, or the way things are now, depending on where in your system you center your energy and focus your processing.
This is a great way to check if something is a mandala effect or not: if you remember something different from your Third Mind than from your First Mind, something likely has changed in the timelines. The reason is it works that your Third Mind can remember across timelines, while your First Mind only sees what is in front of it.
Although the technique depends on your ability to work with your energy system, even if you have no training in this, you might find some results by simply imagining the center of you to be in your guts, your heart or your head.