Much like Microsoft Office's PowerPoint, Google Slides ... the image that you want to use as your background, click "Select" and it will immediately change the background for the current slide ...
Google Slides is an easy tool ... Use transparent images as backgrounds for a cohesive presentation You can use the same ...
Lock objects by Grouping them Lock objects using the Master Slide feature Lock a photo by using it as a background 1] Lock objects by grouping them in Google Slides One of the best ways to lock ...