Columns only show when editing row not when adding


Is there a way to write a show if expression in a way that will hide it when the row is new and just being added but when that row gets edited later the column shows?

My app has a visitor sign in page. I want to hide the time leaving site column until they come back before they leave to add it, otherwise they could guess when they will leave and be incorrect.

I found a solution.
Using a Timestamp column with Now() formula thats hidden.


[Timestamp] + “000:01:00” < NOW()

As the Show_if, the timestamp is not recalculated until the form is closed and opened again.
Meaning the columns will not show until it is edited.