Remove seam line on a coplanar boolean union

I have joined four curved solid objects with the boolean union command. However, there are seams at the joints - is there a way to get rid of the seams so that it is a smooth joined surface?
Please see image.

if it was planar, yes, but since it’s curved, then no.

your best bet is to extract edge curves, rebuild them to be nice and clean, and make a good 4 sided surface, then trim out the hole.

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Hello - if those are all really part of the same underlying surface, you can ExtractSrf them, Untrim one and then retrim with the edge curves of the remaining object - post a file if that does not make sense with what you have.