Help, arches extruding as segments, not smooth

Hi there, I’m new to sketch up so sorry if it’s very obvious! I’m trying to make a groin vault, and when extruding the individual arches, they come out in segments, not one smooth object as is happening in the video I’m watching. Help with this would be great thanks
community.skp (1.2 MB)

Share the SketchUp file so we can see what you’ve modeled and give you direction to fix it.

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Activate hidden geometry (view/hidden geometry) and check if you have edges dividing the surface.

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Amazing thanks guys did not expect such a fast answer, think I’ve got it now :heart:

I’ll try and share the file, any idea how to cut an opening into the top?

You can do it either using solid tools, the vault and the object to make the hole must be solid groups or components, or intersect geometry and delete the geometry you don’t need.

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