Go to the "Routing" panel. Enter two locations in A, and B, then click on Search. The respective route between those two points show up in the map. Now when you click on the "Preview Route" option, the route begins to play as a tour. However, the turn-type icons do not show up at the turning-points of the route, during the preview. This is a bug and should be fixed. The commit that was made which led to this bug: https://git.reviewboard.kde.org/r/122052/ Please go through it in order to get an idea about what could be reverted back to fix the problem.
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.