gallery title position

you can use that

.pbck_gallery_item_desc {
display: none;
}

by my side all image have the same dimensions, and I don't see the problem with the space between images ...

After this treatment you will not see a long description in the Lightbox. There should be available, hidden only in the place of the title

page builder -Elements -> "Single image" Height - (to be the same for all images added in the column next to each other)
page builder -Elements -> "Images gallery" is okay,

I have checked again, but with or without the display none, I never see the description in the lightbox
it seems that there is a problem in the gallery options, because the description is not added to the lightbox
I will check that

wait a minute, it probably works
That's how it works . Thank you very much for your help.