Is this plugin really customizable?

Hi,

I just bought a pro version of the plugin. It seems that there are way too little options to customize the appearance of the gallery. I bought the pro version so I wouldn’t have to add any custom CSS (I don’t have time for that) but when I opened General options and Lightbox options i was hugely disappointed. Here are few things I thought I would be able to do:

1) I wanted to add space between thumbnail images. But when I go to General options -> Justified -> Image margin and increase the amount, nothing happens.
2) I tried to hide the title in the thumbnail image by unchecking the show title -box but the title is still visible.
3) I also thought that it would be possible to customize the lightbox. But no, you can’t even change the border width of the image or change the place of the title and arrows etc.

I’m not happy at all with this plugin.

https://ww.wp.xz.cn/plugins/gallery-images/