Hi Planck,
Before deleting a stack member interface, run the shutdown command to disable the interface.
In versions later than V200R002, the stack member interface XGE0/0/1 is deleted from the stack interface.
<HUAWEI> system-view
[HUAWEI] interface stack-port 0/1
[HUAWEI-stack-port0/1] shutdown interface xgigabitethernet0/0/1
[HUAWEI-stack-port0/1] undo port interface xgigabitethernet0/0/1 enable
In V200R002 and earlier versions, the stack member interface XGE0/0/1 is deleted from the stack interface.
<HUAWEI> system-view
[HUAWEI] interface stack-port 0/1
[HUAWEI-stack-port0/1] undo port member-group interface xgigabitethernet 0/0/1
[HUAWEI-stack-port0/1] quit
[HUAWEI] undo stack port interface xgigabitethernet 0/0/1 enable