How to combine two tables with common headers in google sheets?

Question

I am trying to combine two tables with common headers. The formula below only properly works, if I define the exact start and end row. How can I adjust the formula below to dynamically fetch non blank rows from both the tables.

=iferror({A1:C50;ArrayFormula(hlookup(A1:C1,'Settings'!A1:C50,row(A2:A50),0))})

Sample Input:

Table 1

col 1	col2	col 3
abc	123	789
def	456	1212

Table 2

col 1	col2	col 3
abc	123	78849
jkl	256	1298

Desired Output:

Table 3

col 1	col2	col 3
abc	123	789
def	456	1212
abc	123	78849
jkl	256	1298