I'm not quite sure what you mean, but you can resize your sprite with this block.
set size to [50] %
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Yes, probaly you change the size variable before you made that new sprite. Turn the sprite to size 100 if it is not working, you made thr dot too big. Just for your info, the paint editor automaticly zooms in 2 times when you open it. Turn it to 1 time zoom.
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