The blue municipality boundary has a different CRS than the pink ward boundaries, and it doesn't seem possible to set them both to the same projection. If the municipality boundary CRS is changed to that of the ward boundary, it disappears.

So, the brute force solution is to simply move the blue boundary slightly west, and it will then be aligned correctly. The Vector Move Feature(s) (not Copy and Move Feature) tool is supposedly selected. Sometimes a small white circle shows up inside the Move Feature(s) icon.

It is possible to select the blue boundary, a very thin red line shows up inside it, and it's possible to move it to a new location, BUT the original blue boundary remains where it was, so now there are two blue boundaries. The select process doesn't seem to "pick up" enter image description herethe original blue boundary, but rather copies it and this copy is deposited in the new location.

Also, I'm not able to delete either line, so clearly my approach is fundamentally missing something.

  • just to be sure, did you check that you dont have two superposed boundary in your original layer ?
    – J.R
    May 28 at 9:15

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