This guide explains how you can resize an item that was added to an eCreator page using the eCreator 2.0 functionality and utilising the Unicorn (generic) theme or a theme you have created. If you have a course that was created prior to the introduction of these features and want to have greater control over your pages, you might like to consider applying a new theme and converting some of the items on the page (see Add a new item to an eCreator page if you're unsure how to do this).
Resize a text box/side panel or image by clicking and dragging on any of the triangles (the below image shows where to click to resize a text box but it's the same for an image).
Don't forget to click the Save button near the top of the screen after making changes to your page or these will be lost when you navigate away from the page editor screen you're currently in.