Manually Changing the Size of the SComboBox Button in Editor

[Neuffexx]

Found the Answer to this through another thread:

How to set SButton fixed size Width and Height (not padding)?

ChildSlot SNew(SBox) .WidthOverride(256) .HeightOverride(100) SNew(SButton) ] ];

I think its still relevant to post the answer here since it was used for a different example, and is from a 7yo thread.
Essentially for this instance what I needed was to wrap the button into an SBox to use the .WidthOverride()

<Your Category>.AddCustomRow(...)
     .NameContent()
     [
         ...
     ]
     .ValueContent()
     [
          SNew(SHorizontalBox)

          /*Auto Width required for Adjusting button size to SBox*/
          + SHoirzontalBox::Slot().AutoWidth()
          [
               SNew(SBox).WidthOverride( /*Actual Size of Dropdown Button*/ )
               [
                    SNew(SComboBox<TSharedPtr<FString>>)
                    [
                         ...
                    ]
               ]
          ]
     ];

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Result:

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Hope this is useful to someone at some point, as we all know Slate documentation is basically non-existent.