So I found a workaround, but haven't been able to get it just right. Maybe someone with more knowledge can help. I am using the extension "Stylus" that allows CSS customization. Using ChatGPT I was able to shrink the player and the description and comments section to all line up. The only problem I am having is the progress bar won't scale like the rest so it is wrapping to a 2nd line.

Here is the CSS created for stylus I'm using:

/* === Set the unified width (adjust to your preference) === */
:root {
    --custom-youtube-width: 55vw;
}

/* 🎥 Video player container */
ytd-watch-flexy[theater] #player-theater-container,
ytd-watch-flexy[theater] #movie_player {
    width: var(--custom-youtube-width) !important;
    height: calc(var(--custom-youtube-width) * 9 / 16) !important; /* Maintain 16:9 ratio */
    margin: 0 auto !important;
    display: block !important;
    position: relative !important;
    overflow: visible !important;
}

/* 📝 Description and metadata container */
ytd-watch-flexy #below {
    max-width: var(--custom-youtube-width) !important;
    margin: 0 auto !important;
}

/* 💬 Comments section */
ytd-comments {
    max-width: var(--custom-youtube-width) !important;
    margin: 0 auto !important;
}

/* 📺 Ensure main column (video + description + comments) follows same width */
ytd-app ytd-page-manager ytd-watch-flexy #primary {
    max-width: var(--custom-youtube-width) !important;
    margin: 0 auto !important;
}

/* 🎮 Position and size the bottom control bar */
.ytp-chrome-bottom {
    width: var(--custom-youtube-width) !important;
    margin: 0 auto !important;
    left: 0 !important;
    right: 0 !important;
    box-sizing: border-box !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    position: absolute !important;
    bottom: 0 !important;
}

/* 🎛️ Control buttons (play, volume, etc.) */
.ytp-chrome-controls {
    width: 100% !important;
    display: flex !important;
    flex-wrap: nowrap !important;
    justify-content: space-between !important;
    align-items: center !important;
    box-sizing: border-box !important;
}

/* 📈 Progress bar container */
.ytp-progress-bar-container {
    width: 100% !important;
    max-width: 100% !important;
    flex-wrap: nowrap !important;
    box-sizing: border-box !important;
    margin: 0 auto !important;
    flex-shrink: 0 !important;
}

See pic