A list view is meant for the current page, yes, and also when you edit the list view via Library Settings > Edit View, the changes (filtering, group by, etc.) will only apply the current view as well.
But if you use the Quick Edit feature or change other settings via library settings, that would be a different story, relevant settings including editing ...
once they are defined through Quick Edit or Library Settings in a
view, they are defined for all "folder" views, at any level of the
library, even with unrelated documents.
If you create a new column while in a list view, you create it at for the entire list.
If you show/hide an existing column, this column is shown/hidden for this specific list ...