How did Macbeth show off his kingship?

In the Shakespearean play 'Macbeth', the main character of the same name showed off his kingship in two ways. One was holding a sumptuous banquet after his coronation at Scone. The other was ruling absolutely.

The throne was the ultimate and absolute source of power in eleventh century Scotland. And so Macbeth [c. 1014-August 15, 1057], in the play, made sure that he consolidated his power and squished his opposition. He did so in the beginning months of his rule by eliminating those within his personal circle who didn't give him total, unquestioning support. Examples of his ruthless elimination of acquaintances were the bloodied fates of Banquo and of the entire Macduff household. In the subsequent months and years of his rule, he eliminated countless unnamed Scotsmen. He had them killed and their households destroyed. In the play, therefore, all Scotland writhed in pain and grieved as the Macbeths showed off the absolute powers of their monarchy.