After using foliage tool, static meshes disappear as soon as I drop them, please help!

So it happened after I use the foliage tool to create grass in my game scene, I imported a tree static mesh assigned materials to it and as soon as I drag and dropped it into the scene it disappeared, after noticing I realize that any new actors when dragged and dropped become invisible, may be some settings that limit the number of polygons visible or something else I’m very much troubled please help.