How do I stop cell contents spilling into next empty cell please?

Cell contents spilling into next empty cell on spreadsheet.

There is no special option concerning the issue (afaik).
Possible workarounds:
-1- For the respective cells enable (context menu)>Format Cell...>>Alignment>>>Shrink to fit cell size.
-2- Similar: (context menu)>Format Cell...>>Alignment>>>Wrap text automatically.
-3- Put a space into the unused cells so they are no longer blank.
-3a- If you want to allow formulas easily to find these cells “empty”, fill in there the formula ="" instead of the space.
-4- If you are not afraid of a probable repetition (only for the view), you can also set (context menu)>Format Cell...>>Alignment>>>Horizontal >>>>Choose 'Filled'.