I am new to Apple, and I am new to use a Swiss French keyboard; unfortunately, a lot of useful characters are only available when the option key is pressed.
I would like to have an image of them available to be printed or to be quickly available, so that I can learn them. I have noticed that you can see the layout from Sys preferences > Keyboard > Input Sources > press the option key, but the image is too small and to be honest I do not know how to take a screenshot while pressing the option key.
Do you have any suggestion or good image?