Where can I see my recent senders and recipients?

Once you tap on "send" from the home page, you'll see a list of the recent users who you had a transaction with.

You can click on the user you want to repeat a transfer with, enter the P2P thread, and select either to send or request money from them. You can also use the search bar on top of the list, and search by name or phone number to view the intended user.