If the number of files you want to view fits within the maximum argument limit you can use globbing to get what you want, with recursion if you have globstar support.
For exactly 2 layers deep use: ls -d * */*
With globstar, for recursion use: ls -d **/*
The -d argument to ls tells it not to recurse directories passed as arguments (since you are using the shell globbing to do the recursion). This prevents ls using its recursion formatting.