Exclude all the "Conversation History" folders
You need to use the whole folder path to exclude them.
Press click enter(end of line) to separate different excluded folders.
An example of exclusion is as follows:
Folder1/Folder2/Conversation History
Inbox/Conversation History
Inkorg/Konversationshistorik
Inkorgen/Konversationshistorik
Inkorg/Conversation History
Inkorgen/Conversation History
bandeja de entrada/Historial de conversacion