I know on my macbook, I have a setting where if I hold control and use two fingers o the trackpad, it will zoom. (I have lotsa trackpad things. Like two fingers = scroll two fingers + click = right click)

Yeah, the grass is the hardest plant to see the dead leaves or to cut the dead leaves off of. The astera isn't easy either. The Lemonbush is easier when it's a bigger plant. The scandens and reptans are a pain to trim because you have to clip it several times before you get all of the dead leaves. Things like the tigerferns and those of that like are easier to see the dead leaves and to trim them.

Sometimes it also helps to look at the plants in Snapshot View (clicking the camera) and cycling through the backgrounds - better/different contrast. When you go back to the main screen to prune you'll know where to focus.