I think that the "Trigger" column in the Application Autostart tab should be moved to the right while ensuring that it stays visible all the time. This is how the "Restart Style" column is placed in the Current Session tab.
Theo Linkspfeifer referenced this bugreport in commit 73e1213825cc882c932aafb016f8a13f97c17d34 Improve column layout of autostart tab (Bug #15448) https://git.xfce.org/xfce/xfce4-session/commit?id=73e1213825cc882c932aafb016f8a13f97c17d34