Watch page description below the video with proper open/close toggle, instead of a side bar.
< Feedback on YouTube - Proper Description
That is not a part of the script and never will be.
how to auto expand description
That is not a part of the script and never will be.
how to auto expand description
That is not a part of the script and never will be.
mmkay
If you really want to have the description auto open, add this at the end of the script.
// auto open description
findElement("#meta ytd-expander").then(function(el){
    openDescription(el);
});
function openDescription(aed) {
    var mo = new MutationObserver(function(mutations) {
        if(aed.hasAttribute("collapsed")) {
            aed.removeAttribute("collapsed");
            //mo.disconnect();
        }
    });
    mo.observe(aed, {
        childList: true,
        subtree: true,
        characterData: true
    });
}
how to auto expand description