Look at the top five cards of target player's library. You may then have that player shuffle that library.
If there are less than 5 cards in the library, you look at whatever ones remain and you still get the option to shuffle.
You can’t rearrange the cards. You put them back in the same order or have the whole library shuffled.
This is not a draw and will not cause a player to lose if there are less than 5 cards in the library.