By dramatically increased you mean went from 1.8% during a pandemic when people were afraid to move around to 2.5% as things eased, well in line with historical levels.
I think the OP is much more accurate with the statement "the idea that employees are quitting in droves is exaggerated".
In fact, if you look back more than the year you picked, you'll see there was a huge drop, and the current blip is most likely those people feeling some relief from the pandemic. The rates are no where near out of line historically.
Here's historical data graphed for all 4 regions you listed.
https://fred.stlouisfed.org/series/JTS00MWQUR
https://fred.stlouisfed.org/series/JTS00SOQUR
And it's not a very big amount. If the rate lasts a long time let me know. Most likely, as should be clear from the graphs, there is very little out of the ordinary happening.
I suspect both are up higher than they were in 2019.
Official numbers are up ~50% between Nov 2020 and Nov 2021. IMO official numbers dramatically increased as vaccine mandates occurred and under reported.
https://www.bls.gov/news.release/jolts.t04.htm
Nov 2020 -> Nov 2021; percent change by region:
Northeast 1.8% -> 2.5%
South 2.8% -> 3.5%
Midwest 2.3% -> 3.1%
West 2.0% -> 2.8%