New result line in the console

The console will only output the last returned value, so you'd need to create a variable and keep adding to it in your loop, or an array and then aggregate it as a single string. In both cases just output the variable at the end.

Appending to a string example:

let LastDate := last((select Notify) order by Data).Data;
let output := text(LastDate);

while today() > LastDate do
    LastDate := LastDate +1;
    output := output + "
" + text(LastDate);
end;

output

Array example:

let LastDate := last((select Notify) order by Data).Data;
let output := [text(LastDate)];

while today() > LastDate do
    LastDate := LastDate +1;
    output := array(output,[text(LastDate)]);
end;

join(output,"
")

Both output the same result.