Is the feature you mean called Sets? https://insider.windows.com/en-us/articles/introducing-sets https://insider.windows.com/en-us/articles/introducing-sets L

Is the feature you mean called Sets? https://insider.windows.com/en-us/articles/introducing-sets https://insider.windows.com/en-us/articles/introducing-sets Looks like it was removed from Windows preview due to feedback, they may be reworking it in the background.