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

Did you check the shortcuts tab?

Edit>Editor Preferences>Keyboard Shortcuts

yeah All shortcuts are bind but not working