Software:
Unreal Engine 4.24
To Change the size of the UI and fonts in the Unreal Editor:
- Select:
Window > Developer Tools > Widget Reflector
To open the Widget Reflector window

- In the Widget Reflector window, change the Application Scale parameter:

Like this:
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This is incredibly cool and should be widespread. Much easier than the free marketplace UI plugin. Cheers!
Pretty Cool, everything looked very tightly packed and mashed up on Scale 1.0, turned it to 0.8 and wow it feels like I can breath in the editor.
Shame you have to do it EVERYTIME you open your project. I get if it’s a new project, but setting everything to default when you open your project again sucks.