First of all, apply your object’s scale. It’s non-uniform (squashed on X axis) - this affects unwrapping tools. Although…
…second of all, the one on the right is nothing more than Project From View. Look at your object from side view, select all faces and call that operator. Afterwards, if you need to squash it horizontally as on the right object, you can just scale UVs on the X axis in the UV editor.
Project From View doesn’t care about scale, but still, when modeling and unwrapping, best to keep your scale uniform (and even better - unit: 1, 1, 1). Non-uniform scale affects various tools, adversely.