Dave Bonta's short poem is about finding richness in very little. The speaker leaves their troubles behind, and the way they do it is almost comically modest: a bowl of oats for dinner. There's no feast and no grand gesture, just a simple meal and a quiet change of mood.
The second half gives the poem its lift. The speaker has a window onto the sea and another onto the deck, and the closing simile, "like a king," says it all. A king might have wealth and servants, but this speaker feels equally lordly with plain food and a good view. The title, "Living Large," plays on that idea, since largeness here comes from space, light, and water rather than money.
The mood is relaxed, contented, and a little playful. The speaker seems to smile at the gap between oats and royalty, yet the contentment feels real. Troubles aren't solved, only set aside, and that's enough.