I am trying to create a seamless pattern in Affinity Designer. However, when I got to place my tiles (squares with pattern inside) next to one another I end up with very thin white lines between the tiles even though they are placed exactly next to one another. Is there a way to get rid of these lines? Some articles I have read mention anti aliasing being a problem, but I cannot find a place to switch this off in Affinity Designer. Any help would be much appreciated.