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Probably.... But in this case, most time I don't need outlines. I don't have that problem in illustrator. Let me simply draw an example. That damn middle line!!

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Oh...I see. But my problem was vector, not pixels. Two objects can't get close enough to see the gap unless they are “combine” or “add”. There's always a line in the middle, It was a gap that could not be filled.. Please zoom in my picture, you can see a very thin line. I want to be free to modify the symbol content and keep the object symmetrical.(Like mirror tools) Help me, plz!!

Hi Callum, Thanks for your response. I've read these responses. https://forum.affinity.serif.com/index.php?/topic/54768-affinity-photo-ipad-anti-aliasing/ and quote the passage by MEB: ”With the Polygon Marquee Tool tool selected, check if the last icon on the top right on the context toolbar (looks a triangle) has an outline around the circle. If so the antialiasing is enabled. If not, tap the icon to turn the antialiasing on - the outline around the circle should appear.” If that's what you mean... I'm really sorry that I don't understand. I couldn't find a icon on the top right on the context toolbar and looks a triangle... If you can mark the possible answers with pictures, maybe you can help the stupid me. My english is not so good, but I hope you understand what I write. Thanks again for your response!

Excuse me, how do I fill the middle line? Except to draw another line for it. In the picture, they are rectangle and symbol.