Indefinite Retention

I’ve recently started using influxdb and am confused about the retention policy. I’ve set the retention policy as inf and shard group duration as 1w. Does this mean that this shard will NOT get removed after a week? If I check ‘show shards’ I can see that the shard has an expiry time 1 week from now. Is this fine or do I have to do something so that my shards never get deleted.
In the end, I want to store my data indefinitely. Any help would be appreciated
Thank you