Removing edges from smooths surface

Hello,
I need to remove these edges leftover from the original curves that I have swept.
I tried merge, and I tried weld, and I check for naked edges, but I don’t seem able to get rid of these lines.
The end result I am looking for is a smooth surface (a cylindroid) that has only two edges (the close loops at the base and top).
If there is a slight crease at those edges I pointed at, it would be fine to smooth it out, that is, rebuild the surface to be continuous everywhere.
Alternatively, could I work on the original curves to avoid those edges altogether?

Thank you!

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Hello- you can set the display mode to hide tangent edges. There is no way to have a closed surface that does not have at least one seam edge - whether or not it is displayed.

-Pascal

Thank you Pascal.

However, it is not a display issue, it is a problem when I export the mesh: those edges show where I wish they would not.
I understand one will have to remain, but how to remove the others?

Thank you!

Hello- Explode, then MergeSrf with Smooth=No should let you close it up. But if you have a tangent discontinuity - a crease - between two of the faces, that should be fixed first.

-Pascal

MergeSrf with Smooth=OFF worked!

Thank you, the surfaces were joined without edges remaining.

Regards