Make object unselectable in viewport?

Is there any way to make objects unselectable in the viewport ? For example I have placed landscape and skybox to my level and some static meshes on top of landscape and want to work only with those meshes. But the skybox and lanscape are always being selected if I try to work with multiples objects, which is really frustrating. Is there any way to make them unselectable (like in 3dsmax with “freeze” for example) ?

Try checking “Strict box selection” under quick settings - it was prevent the skybox & landscape from being selected unless your selection box encompasses the whole level.