How do i do a curve please?

I am trying to recreate this white arc on Beauty By The Bay on another picture. Does anyone know how this is done, i tried Figma but does not seem to work but I am new to this. I can see it is two arcs but I am having trouble doing a smooth arc at the moment I just have a white heading at the top (see other picture). Any help would be awesome.

You can make a frame and round the top left corner like so:

image

Then add a thick stroke:

image