Are you using the Block Editor (Gutenberg) or the Classic Editor? If you are using the Block editor there are block patterns just for the kind of layout you describe, and you can specify if you want the photo to open in a lightbox. Some blocks with wider capabilities are available through various plugins.

I am not familiar with the photo plugin you are using, but it may have a setting for images that are added in the Classic Editor using the Add Media button at the top of the editor.

The best practice, when trying any new plugins and checking for functionality and conflicts, is to try them on a local development site or a staging site on your host. You can contact your hosting company to see if they offer that and get help setting it up.