After you installed Zoomtext, at first run, the software should have detected the presence of two monitors and asked you if you want to activate the Dual Monitor feature. If this didn't happen, you can enable it by selecting Type > Dual Monitor > Enable (or disable) from the Magnifier toolbar. If you want, you can press the Dual Monitor on/off hotkey: Windows + Shift+ D.
After enabling the feature you can select the view type by selecting the desired view from Type > Dual Monitor. You can also switch the dual monitor views by pressing
the Dual Monitor View hotkey: Windows + Shift+ Z.