I asked this question not long ago, if you are on PC there is a workaround: https://forums.dovetailgames.com/threads/size-resize-of-ui-elements.69213/#post-638352
Exactly. That’s the answer to his question. A quick simple look in the settings would have answered it far quicker.
I did see anything in the settings to resize the HUD. I must not see it? But I added this the engine.ini file and it worked. [/Script/Engine.UserInterfaceSettings] ApplicationScale=0.500