Справка LibreOffice 24.8
Enable direct cell content editing.
The cell edit mode enabled on a cell with formula displays the formula expression instead of the result of the formula calculation.
In this mode, references to other cells are displayed in colors and the referenced cells have their borders highlighted with the same color. The highlighted cell displays handles on the corners to allow by dragging the handles, to extend the highlighted reference. The formula is automatically updated with the expression of the reference.
For example, a cell with formula =A1+B1 displays A1 in color 1 and B1 in color 2 (colors are defined internally). The cell A1 is highlighted in color 1 and B1 is highlighted in color 2.
Press Enter to end the cell edit mode.