Answer:
You are right. Window "1.4 Longitudinal Reinforcement" shows all surfaces connected to the nodes selected for design. This means also those walls at the wall corner requested by you.However, the definition of the position of the longitudinal reinforcement for these walls is not relevant for the punching shear design in the floor slab.
As of RFEM version 5.19.01, a filter has been installed that allows you to display only those surfaces for which the definition of the position of the longitudinal reinforcement is relevant.
You can find the Filter button in input Window 1.4 on the bottom right. See Image 01.