If somebody else has safe mode on and you need to use it, you can use CTRL+X in the terminal, which will allow you to take the safe mode session from the other user. Note that there can at any time only be one user on the same device with safe on. If you want to leave safe mode and drop your changes, in the terminal you can press CTRL+D. In the terminal, you can enter safe mode with CTRL+X, and leave safe again with CTRL+X which saves your changes. If you quit safe mode without saving, the F actions are removed. If you leave safe mode normally your changes are saved, and the F actions, will become U actions that can be undone. While you are in safe mode, RouterOS adds "floating-undo" actions, marked with a "F" in the history. If something breaks, you can then quickly close the connection and all your changes will be dropped, and everything is back as it was. Safe mode is also very convenient when you are making changes, you are not really sure will work. If you loose the connection to Winbox/ssh while in safe mode, it will remove all the changes you did, so if you made a mistake while editing the firewall and locked yourself out, the changes will be dropped and you will again have access. To be safe when making changes - especially in the firewall - you should use the safe mode option.
Say, if you undo 5 changes, and you yourself or another user then make another change, the undid changes are removed from the history list, and it will only show the older changes, and the new change that was done by you or another user. If one user undo some changes, they can only be redone, while no other changes have been made in the router.
The history list is global for all users, so what one user changes can be undone and redone by other users. If you can't see anything in the column in Winbox, try to increase the column width. In the history list, you will see an U at the left side if the action can be undone, and an R if it can be redone. Using terminal you can type /undo or /redo.
In the top left section of the Winbox interface you can use the arrow back to undo (go back) and the arrow forward to redo (go forward again, after going back). Note that Winbox shows the latest change at the bottom, while the terminal shows the latest at the top. The history is accessible through Winbox ⇢ System ⇢ History or through terminal/ssh using /system history print detailed. All MikroTik RouterOS devices keep a history of user actions.
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