In the “effect of electric/ magnectic field on a moving charge” experiment, the brightness of the dot on phosphor screen is too faint. I have tried to increase the flux of electrons, but it does not change the brightness of the dot on the screen (which is in itself technically wrong and unrealistic).
Since I am teaching online these days and therefore I do share my screen with my students, some of them are having trouble to see the dot on the phosphor screen.
I do not think this is an error on my part/computer, I think this issue is by default. In either case, I am running the simulation on a Windows10 computer.