To view ALL formula on Spreadsheet

edit

Use shortcut CTRL + F10 to toggle view of formulas

Try setting the display formula option.

In the menu "Tools", "Options...", expand "LibreOffice Calc", select "View" and then under the Display settings enable "Formulae".

Edit: Adding macro which shows precedents of every cell in the range selected when the macro is executed. This is only a quick attempt and probably in need of some optimisation.

Do NOT select every cell of the worksheet as this will take a very long time as it includes all unused cells.

Sub TraceRangePrecedents()

    Dim oRange As Variant
    Dim oRangeAddress As Variant
    Dim oController As Variant
    Dim oDocument As Object
    Dim oDispatcher As Object
    Dim ic As Integer
    Dim ir As Long
    Dim sCell As String

    oRange = ThisComponent.CurrentSelection
    oRangeAddress = oRange.RangeAddress

    oController = ThisComponent.CurrentController
    oDocument   = oController.Frame
    oDispatcher = createUnoService("com.sun.star.frame.DispatchHelper")

    For ic = oRangeAddress.StartColumn To oRangeAddress.EndColumn
        For ir = oRangeAddress.StartRow To oRangeAddress.EndRow 
            oController.select(oRange.Spreadsheet.getCellByPosition(ic, ir))

            oDispatcher.executeDispatch(oDocument, ".uno:ShowPrecedents", "", 0, Array())
        Next ir
    Next ic

    oController.select(oRange)
End Sub

Hi

I know this is not what you expect (display of blue lines auditing for all cells in one command) but a simple command might help you in diagnosing: View▸Value Highlighting (Ctrl+F8)

Text cells are formatted in black, number cells in blue, protected cells are shown with light grey background, no matter how their display is formatted, and formulas are formatted in green.

HTH

Regards

In Libre Calc 5.4 there is a command View | Show Formula you can click and that will show all formulas. They aren't colored nicely, but they show up.