Standard Layout
In LessonUp's standard layout options, you can always zoom in on an image by clicking on it. This applies to the layouts within a slide and in the interactive elements of quiz and open-ended questions. There is one exception: zooming in on a background image is disabled when there is text in the slide. This is to prevent accidentally touching the screen, causing the image to enlarge and the text to disappear.
Image Component
When using an Image component, you need to specify whether you want to enable zooming. You can do this through Settings (the cogwheel and pencil icon). Then, check the box for 'Allow zoom during presentation'.
Important to note: You need to specify this for each individual Image component. If you duplicate the component however, this setting will be automatically included in the duplicate.