I’m not sure if this is what you are wanting, but there is a “Search Folders” option you can enable in eM Client. See the following thread.
https://forum.emclient.com/t/outlook-like-search-folder/69664
I’m not sure if this is what you are wanting, but there is a “Search Folders” option you can enable in eM Client. See the following thread.
https://forum.emclient.com/t/outlook-like-search-folder/69664