Press Insert to toggle between overwrite mode and insert mode. The current mode is displayed on the Status Bar. The text cursor must be enabled in the cell or in the input line.
Insert mode is active. The area in the status bar is blank, when Insert mode is active. The text cursor is a blinking vertical line. Click on the area to activate the overwrite mode.
The overwrite mode is active. The text cursor is a blinking block. Click on the area to activate insert mode.