This isn't really a feature of the cli. It maps to the undo action (generally speaking) within Windows unless it has been re-mapped by the application you are using. In Windows for example using Windows Terminal and OpenSSH an Alt+Backspace will simply remove the last entered word.
How exactly are you connecting to your firewall and in what program? It's very possible that whatever you are using to connect simply doesn't allow that shortcut to be utilized.
Click Accept as Solution to acknowledge that the answer to your question has been provided.
The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!
These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!
The LIVEcommunity thanks you for your participation!