How do you remove \\ from your artist and title field
You first should check if you have Multiple Artist and or Title Fields through
Extended Tags or ALT + T. (multiple-valued fields are separated by \\).
If not, why not create a Replace Action
http://help.mp3tag.de/options_format.html#replace
And if you want to combine Multiple fields into only 1, then
(Example uses the field ARTIST)
Create an Action Format value
Field: Artist
Format String: $meta(artist)
Update 13:22, Added Screen shot