What are good methods of visually securing sensitive information that might appear on your screen from the outside world?
An example to illustrate my question would be the following:
You're sat in a coffee shop using WiFi to do some work. You want to be able to work without others potentially seeing or stealing information that may present on the screen or typed into the keyboard.
Given this scenario, what steps would you take to minimize as much as possible the likelihood of exposing or compromising your personal data from a visual perspective?