Now on MyHeritage you can filter DNA Matches to show only those in a certain Genetic Group. Use the new search field under Filter to select any of the 2,114 Genetic Groups your DNA test reveals.
I have 21,156 DNA matches from close to distant at MyHeritage. Filtering by Netherlands, Germany and England I have 6,078; by Netherlands, Germany and England 7,090; by England 4,653 and by Eastern and Central Europe, mostly Poland, Germany, Ukraine, Lithuania, Belarus and Russia 9,859; and by Northwest England 1,464. Some of the matches are in more than one group — unsurprising, and there are many more in my one grandparental endogamous line.