How do I set the font size of the UMG ComboBox (String)?

Development Programming & Scripting UI
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58

Just to make the Simple Answer more visible:

You simply need to add a ScaleBox to your widget, specify the size you want it to be (for example X: 400, Y: 80), then drag your ComboBox into the ScaleBox in your widget’s Hierarchy Panel and hit the Fill Horizontal and Vertical buttons.

Thanks to BitOWhit and for the solution.