Hi everyone! I have tried to present my Mathematica documents (.nb or .cdf) to my students in class by connecting my laptop through a projector. Unfortunately I can't see in my computer simultaneously, what is being projected, no matter which alternative I use to connect (like duplicate). In order to see it myself, I need to turn to the screen when I have to do some slight changes in my inputs, for instance to answer some questions. It is difficult to use the keybord when the screen of laptop is "blue". This problem does not exist in power point, because one can see what is projected in the screnn, by just looking at the laptop's screen. Can anyone help? (I have Mathematica 11.2 for windows). Thanks!