The "Enter" and "Tab" buttons in the zoom window are the most important controls. As such, they are placed on the right side of the zoom window, in order to make them readily-accessible for right-handed writers. However, for left-handed users such as myself, the infrequently-used "indent" buttons are more prominently located.

Since you know the handedness of users via the "Writing Posture" setting, perhaps that setting would automatically swap the positions of these buttons in the zoom window. Thank you.