*I hope to have a formula that can concatenate A and B columns but each texts within cells shall still sit next to each other.
Here is the sheet:
https://docs.google.com/spreadsheets/d/14OKObszKg5TiIYeSr929PmCi7WDKciQ_A4kOFTEeZdo
>Solution :
Try-
=JOIN(CHAR(10),INDEX(SPLIT(A3,CHAR(10))&SPLIT(B3,CHAR(10))))