Solved : thanks to other forums i was able to figure it out and shared how to fix it below
By mistake i unticked always show dialogue box in unreal engine Packed level actor
as you see in this image so how to fix it if you unticked is
by going in the folder structure as shown below of your project .
and open .
EditorPerProjectUserSettings
open this file and find this by search in notepad
Always Show Dialog=True
[/Script/LevelInstanceEditor.LevelInstanceEditorPerProjectUserSettings]
bAlwaysShowDialog=True
PivotType=CenterMinZ
bKeepFoldersDuringBreak=False
I hope this helped you and if did write a comment so i know that as well.