All my instruction simply say plug in a keyboard and monitor to R-p4, but My keyboard and monitor are being used by Manjaro.
I imagine another course of action would be to open up some sore of environment for the R-p4 inside Manjaro (this is what I assumed would happen) but there is no clear path forward.
I would interface with my Raspberry Pi through SSH, but you can also connect a real monitor and real keyboard/mouse, just that what you would like to do (connecting your laptop hardware to your Raspberry Pi) is most likely not possible (maybe the screen if your laptop has a video input but I don’t even know if that exists).