in winbox
when the lo interface be selected , the remove button was not available ,because the lo intface is system default ,it cant be removed
but
When I select both the lo interface and any other removable interface (bridge\gre-turnnel\pppoe-client\pptp-client) simultaneously, the remove button will be available!! ，and can remove them successfully at the same time!!
What’s going on
If discovered in a timely manner, it can be restored by pressing the undo button
But if there are too many operations, it will be impossible to use the undo button
How to add the lo interface back at this point ，i love it,i dont want to lose it 
