Dropdown menu invisible

i am having problems of dropdown menu of unreal engine 4 all functions not showing dropdown menu?
mesh material none area showing no thing all dropdowns are invisible

Can you share a screenshot of your issue? It’s hard to figure out what exactly doesn’t work for you. You cannot see a dropdown list at all? If you made some changes in your layout you can restore the default settings by going to WindowReset Layout. If you can see a dropdown list but it’s empty you may not have any valid assets in your Content Browser. If that’s not the case then maybe you are filtering out your dropdown list (View Options in the bottom right corner in the dropdown list).

Do you mean a dropdown you made or the ones that are part of the engine (such ■■■ to add component)?

the menus that are part of the engine