Change the image size
In order to change the image size in a gallery, click on Pages and select the gallery page in question. Click on Display settings and under Image size, choose the size that suits your needs. Depending on the layout the rendering will differ.
You can choose between: Extra small, Small, Medium, Large and Extra large.
You can also change the thumbnail decoration. To edit thumbnail decoration go to Colors & Fonts > Thumb decoration.
Change image size