Unable to centre align photo gallery image (Photonic) in column horizontally

[StuartP]

Fairly new to Elementor but have some earlier experience with website layout. I'm using the excellent Photonic gallery plugin pulling images from Google Photos for a local camera club I am a member of (and the webcontroller!!) The plugin works great however I am unable to centre the images within the column control regardless of the changes I have tried. I found this forum via a search looking for the answer, which the use of html center tags was supplied, I have tried that too with the same result. I have added borders to the inner section and columns in the images below to show how the photos are aligning. The first is the elementor layout, the second is how it displays on the page.
Any help on how I can correctly align the images will be appreciated.

Stuart

, the first