It is a pain to switch back and forth between my main computer UI setup and the Pi setup, so I enable SSH on the Pi so I can just control it from my main computer. However, SSH is not enabled on the Pi by default, so we have to do that first.
Environment and pre-requisites:
- Raspberry Pi 4 Model B with keyboard/mouse/LCD panel attached
- Clean install of Raspbian via NOOBs
- Connected to WiFi, new password for Pi user
- MacOS for main computer
Step 1 - Enable SSH
- On the Pi's keyboard/mouse/LCD setup, open a terminal window and type:
sudo systemctl enable ssh
systemctl start ssh
- It will pop up a box asking for your password - enter it, and SSH will be enabled
Step 2 - Find your Pi's IP address
- Find your IP address by opening a terminal window on the Pi and typing "ifconfig" - if you're using WiFI, the inet address under the wlan0 interface will show your IP address - mine is 192.168.50.21

Step 3 - SSH into your Pi
From your computer:
- Open a terminal window and type (replace the IP address with your Pi's IP)
ssh pi@192.168.50.21
- It may show you a warning (type yes) and will ask for your password. Once you've entered your password, you'll get a "pi@raspberry:~ $" prompt - you're in!

That's it - you can now access your rPi remotely (as long as you are on the same LAN).