Huh? If they're not included in the main chain then they don't exist. There is only one chain - the longest chain - the "main chain".
That's not necessarily true.
These transactions do still exist inside of orphaned blocks.
They are not part of the main chain, but these blocks do exist. And they are indexed and searchable.
Does anyone know how to see transactions that are good, that are not included in the main chain.
You can view the block info of orphaned blocks here:
https://www.blockchain.com/en/btc/orphaned-blocksThe orphaned blocks are valid blocks which are not part of the main chain, but contain valid transactions.