Cover it up.
One-by drivetrains are becoming more prevalent for obvious reasons like better ground clearance, less complexity, and optimized gear ratios. The problem is most manufacturers, like Pivot, design its frames to be compatible with direct-mount front derailleurs -- leaving an eyesore to an otherwise fluid design. Thankfully you can cover up those mounts with Pivot's Derailleur Cover Plate.
The Pivot Front Derailleur Cover Plate comes in black with the Pivot logo. It includes a mounting bolt and is constructed from aluminum.