Gallery - Thumbnail height

Hi Balbooa,
Using the gallery component, I have four images, configured to display in 2 columns. I.e. a 4x4 grid. All images are 1:1 ratio (or thereabouts)

Can you please tell me how to control the height of the thumbnails images. I've tried changing the layout and the Compression -> image width height settings, but the overall height of the gallery is not changing.

Many thanks,

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