I can not flatten the surface

Paluba ispod topa-2 v5.3dm (49.8 KB)
Hello! Can somebody help me to flatten the surface. I am using Rhino just one day.
Thank you a lot for any help.
I attached the file with the drawing.

Are the facets of the mesh intentional? Unrollsrf will not work on meshes, redrawing as a surface is one option.

Here i extractedMeshEdges, then joined the curves and lofted. Unjoined one edge and used Unrollsrf
Paluba ispod topa-2 v5.3dm (434.6 KB)

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If the faceted surface is needed, then you can convert the mesh to a NURBS polysurface using ToNURBS or MeshToNURB command. Then UnrollSrf the polysurface.

IMPORTANT - ToNURBS and MeshToNURB simply replace every mesh face with a separate planar NURBS surface, and the surfaces are joined together into a polysurface. The result frequently is too complex to be useful. If you are going to work in Rhino effectively you will need to learn to work using NURBS curves and surfaces.

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This drawing is imported from the Fusion as *.OBJ file. I will try to redraw this thing as a surface, but I must see how.
Thank you for the help.

David, thank you!