Sorry to border, the search option here did not provide me an answer.
After installing Sumatra PDF at my Samsung Galaxy W703 tablet, I want to use it as my eReader program. But the option + to zoom in, to get the font bigger, does not work, neither in laptop mode (with the external keyboard), nor in tablet mode with the virtual keyboard.
How can in zoom in and zoom out now? With bad eyes, I really need that option.