Let us call what Paul's code does a "Process," or "Processing" so we can avoid confusion.

Applicable Range is that Range that was Processed, and/or needs Processing. I think what you meant when you said, "Entire sheet."

As I understand, the Process converts formulas to values.

One can set up Paul's code to Process: A Selection; The entire applicable Range; Or only the unprocessed, (new,) Cells in the applicable Range.
Set Start = Range("A:A").Find(What:="=", LookIn:=xlFormulas)