Grid - Can't Remove Auto-Generated Column

I’m using a grid for a photo gallery and I’m working on making it responsive. On desktop it’s 2 columns wide, but I want to make it a single column grid on anything smaller, to show the images as big as possible.

On tablet I removed the second column, but it still auto-generates a second column. I don’t have “auto-fit” on anywhere and can’t seem to figure out how to turn it off. Super frustrating. Any help would be appreciated. Thanks.

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Found the solution: All grid children must be auto positioned