Over the years every engineer gathers some know-how in terms of hardware and software tools. Whenever I work closely with other people in projects I notice that my tricks differ from theirs and vice versa. Sometimes learning one simple keyboard shortcut from a colleague saves me 15 minutes of work-time every day. That is why I wanted to share with you some of tips&tricks that I use. Some of them you already know, some of them you don’t.
I will start with Eagle, because I am currently RoadTesting v8.x. When I am designing PCB, at some point I want to check how GND plane is filling the PCB and if there are no GND traces bottlenecks or I want to see only dimension layer and tNames layer to preview the silkscreen. Both of these cases are hard to visualize when all other layers are visible. That is why I am choosing only the layers I want to see in Layer settings. After I do that and analyze my design I want to go back to the view of all previous layers. To do that I turn on all previous layers by ticking them in Layers setting … I am joking, that would be stupid and take a lot of time. One way to go back to the previous view is to save your project BEFORE you make changes in Layer settings, then display all the layers you want and WITHOUT saving the project, close Eagle PCB design window and open it again. You should see the previous view. But if by mistake you hit Ctrl+S in a heartbeat, you will regret it because Ctrl+Z won’t bring your previous layers view back 
However, console command comes to the rescue. You can type
display last
and hit enter. This will bring the previous view back. Just remember not to close the Eagle PCB design window when you save the project on the unwanted view.
