The suggested words on the top row of the samsung keyboard can be deleted by long pressing the word which you want to delete from the dictionary (learned words).
This does not work for the leftmost word though (bug), and only works for the second word and on.
Hello Ali13798, thank you for posting. I understand the Samsung Keyboard only works to delete second word. Please, submit an error report directly to Samsung.
Right after the issue appears, please submit an Error Report. Samsung Members app->Get Help->Feedback->Error Reports
