With this configuration, you're better off staying on Elgg 3.

Just update on the latest version.

I remember that it's possible, you need to set the correct lightbox options I believe.

Have a look at https://www.jacklmoore.com/colorbox/

or maybe you need to store the 'parent' state in a var or something like that.

Thank @jerome, 

I spent some time on the lightbox options, but I didn't find any useful for my problem.

Does anyone have any solutions for me?

It's a question about JS experience.

Look at jQuery API.