Keyboard shorcut keys / hotkeys dos'nt working

I recently installed the UE4 4.16 on my laptop, and I seem to have run into an issue where the Keyboard shortcuts in the editor won’t work like B+Left click to add the Branch node in the Blueprint or L+left click to add the Lerp node in material editor doesn’t work…

plzz ans my question

yeah All shortcuts are bind but not working

Did you check the shortcuts tab?

Edit>Editor Preferences>Keyboard Shortcuts