LTSPICE: How to display traces automatically when press Run Button?
After running the simulation, plot the desired waveforms, then activate the waveform viewer (click on its area), and then click on the Save button in the toolbar (or in the File &gt; Save menu). This creates the .plt file. Whenever you first run the simulation, or when you open up the waveform, the saved traces will show up. This answer was also here.