After taking a 7th look in settings i found the problem
When u connect ur external to ur computer And open rekordbox
after selecting ur external device i went over to the ' category ' tab on the right
i think i added Artist to the Inactive Categorie by mistake because i was making some default categories in active ...and I probably added to the inactive side by mistake
i now added it back to active categorie side
and now im able to search for whatever artist i have in my playlists!!!!
for those who are also stuck witch something like this !!!!