No idea whether this will work for others, just sharing an observation.
I noticed with some dismay recently that Google had moved to less helpful volume range estimates in AdWords e.g. 10-100, 100-1K.
All my accounts have currency as £ - except one that was set up in Euros. That account is still showing the OLD (far more informative) volume range estimates.
No idea whether it would work for a new campaign.