It looks to me that DWC Machine properties only shows as many endstop as drives it knows about. So check your M584 command and add extruders if necessary. For example, if M584 without parameters reports E3:4:5 then send M84 E3:4:5:6:7:8:9. Then create a tool using extruder 6 (aka drive 9) e.g. M563 P10 D9. After that, Machine Properties should report all the endstop states (it worked for me).