Hi @Jarrod ,
I did a test locally, and there was no blank space between the tablix. Please check whether each tablix fits perfectly.
Did you use the rectangle tool? If the rectangle tool is not used properly, it may cause unnecessary blanks. You can try to create 11 rectangles of the same size and consistent arrangement, which fit closely and are aligned on top. Then drag these Tablix into the rectangle respectively.
Best Regards,
Joy
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