I found something today i saw on the steam/Banished discussion forum.... I thought it was important to put a copy of what a guy he said....
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This is implemented in the game. It's in Options > Game > 'User Interface Scaling'. Lower values make the UI elements larger, but it only goes down to 75 in game. If you edit the registry, you can change it to a different value (50 is a comfortable value for me at 4k res)
Location: HKEY_CURRENT_USER\Software\Shining Rock Software LLC\Banished
Key name: GameUIScale
i want to thanks Chesthair Ascot for the info.