What does it mean if a node is shown Ch:3 in node list?

1

My T-echo works but is the only node in the list shown with Ch:3

Screenshot_20240902-175841~2
Screenshot_20240902-175841~21080×2520 191 KB

What does this mean and is it my doing? Does it matter? (It works.)
Thanks.

2

Its NodeInfo was last heard on your channel with index 3.

3

Ah. Thanks. But I have not indexed or set chanels. I only have one “channel” so I thought… where is this set?