Could you please provide some source? I find this really hard to believe. Quick googling led me to some articles about growing ratio of _young_ adults (16 - 23) living with their parents, nothing about adults.
https://www.pewresearch.org/fact-tank/2020/09/04/a-majority-...
18- to 29-year-olds living with their parents was 46 before the pandemic, up to 52% now. Although it is more a regression to the mean, historically.