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AH and DE are load bearing walls that is why. The question is about the need to draw "loading sketch" so that why reactions don't matter.

quick update: After further investigation, I concluded the following: Etabs considers the stiffness of the connected members in order to determine the level of fixity. This can be easily verified by modeling multiple portal frames with the same beam size and different column sizes. Shell elements without mesh have a high artificial stiffness that is not representative and is unrealistic. In addition, i came across an ETABS manual by Atkins, where they recommend the following : If the shell element (wall) has a refined mesh, consider extending the beam into the wall at least one shell element to model proper fixity.