מלכים א, פרק א׳, פסוק מ״ו

The completion of Solomon's coronation takes immediate and practical effect. By taking his seat on the royal throne, the transfer of power becomes a public reality, an event witnessed directly by the people [ביאור שטיינזלץ].

This physical act of sitting on the throne serves a specific purpose. It emphasizes that Solomon is not merely an anointed crown prince waiting to take over after David passes away. Instead, he steps fully into his position, assuming power and beginning his active rule right away [מלבי״ם].