Hi @shubham, the number that you’re seeing in the left column is actually the row ID. When a row is created, it will receive a unique ID, and that one will never be reused again. If you, for example, create 5 new rows, and you delete those, then the IDs that those rows had will never be used again, and can result in a gap in the left sidebar. It’s also possible to change the order of the rows, resulting in them not being sequential anymore.
If you prefer to see a sequential count, then you can change that by clicking on the icon above the IDs. See the video below for example: