Bravo David and the whole team for this fantastic tool that I've just discovered!

I've just used the Montage module for the first time to make this montage.
I couldn't do it in one go, because there were too many pictures.
So I made the horizontal strips first.
Then I assembled them vertically.

Is there another way to do it?

I think your procedure is probably as quick as any.

The montage syntax for a custom layout is extremely tedious, it works with pairs of items so you have to build up from a base of two images. It ends up with a mountain of nested brackets. This for example, is only a 6 image, 2x3 stack: V(V((H(0,1), H(2,3)),H(4,5)) Imagine a 12 x 8 combination.

One possibility is toggling visibility on selected layers, and using the input selected option. Fairly quick if you know how to toggle layer visibility and use ctl-f to repeat gmic.



With a bit of editing you can end up with distributed layers, but a cumbersome process.

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Have you tried the alternative montage, Testing -> Afre -> Montage-X which has a slider to set the width