You can zoom in/out the image by clicking the following buttons:
- Zoom in;
- Zoom out;
Alternatively you can press on keyboard: "+" or "-" keys. In fact you can press "=" instead of "+" (don't hold Shift when you press "+").
Mouse wheel also works for zooming in/out.
If you work on notebook, place two fingers on the touchpad and pinch in or stretch out.
There are two more buttons to help you with zooming:
- Toggle between 100% zoom and zoomed to fit
- Select an area to zoom into;
In the "View" menu it is also possible to select desired zoom value.