U2719D, connect multiple computers

How to connect the following:

Lenovo laptop - USB and HDMI

HP laptop - USB and HDMI

Logitech wireless mouse and keyboard (USB mini receivers)

1 set of speakers 3.5mm

Dell U2719D monitor (1 USB upstream,  4 USB downstream, HDMI, DP)

I want to leave both computers connected at all times but only use one of them at a time (only 1 computer would be powered on at any given time).  I do not want to type on the laptop keyboards at all.