Is it possible to “group by”, like you can in finder? For example, I have a folder full of invoices going back 10 years. In Devonthink I can sort by date created, which is a start. But in Finder, I can then Group these items in the same window - every year is separated out (see screenshot below as an example):
No, this is not possible (nor is it the Finder 
). First request I’ve ever seen but it’s noted.
Not sure what you mean by “nor is it the finder”? That screenshot is indeed of Mac Finder.
Nor is DEVONthink the Finder 
I feel like I’m missing something here lol. I am aware that they are 2 different things!
Just teasing you