When working with Writer there are two different modes of text entry, insert and overwrite mode. When you are in insert mode and you begin typing, text is inserted at the current position. All text ahead of the cursor is simply pushed further to the right to make way for the new text. In overwrite mode text you type replaces existing text.
The Insert key on the keyboard acts as a toggle switching Writer between the two modes. The current mode is indicated on the status bar at the bottom of the screen.
The status bar below indicates that Writer is in Insert mode.
If we press the Insert or INS key, the status bar will change to indicate that you are now in overwrite mode.

When we execute a command on some text, for example delete the text, we are able to reverse what we have done. This is known as the undo function. It is also possible after having undone the change, get it back. This is called the redo function.
Writer actually keeps a history of recent changes you have made.
Pressing Ctrl+Z undoes the last change you made. Pressing it a second time, undoes the one before that, and so on.
An alternative method is to use ->. When you use this method, the menu will indicate what type of operation you will be undoing.
For example, the following screen segment shows that the last operation was the creation of a new paragraph. The undo will remove this new paragraph.
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Yet another way of carrying out undo is to press the undo icon on the
function bar,
.