I use Excel for Mac on my Mac mini. Software is current and up to date both in Excel and Apple Operating System..
Whenever I try to drag a formula the program keeps defaulting to show the value not the formula.
All preferences should enable the formulas to show:
Calculation is automatic.
Fill handle and dragging and dropping is on. (It always allows dragging but then shows values not formulae).
I usually have to manually enter the formula in the new cell and then it starts to show the formulae from then on. UNTIL NEXT TIME I GO INTO EXCEL.
Some of the spreadsheets were created in earlier versions of Excel but have all been updated ("saved as") in the current format with the current extensions.
Can't see any other answers for this specific set of problems. Sorry if it's there and I have mixed it.
The problem is not improving or going away.