javascript:(function() {
 /* Global variables. */
 var expandButtonYouTubeTopSubscriptionToggleBtn = /* show more */
  document.querySelector('ytd-guide-entry-renderer#expander-item[role="button"]');
 
 var collapseButtonYouTubeTopSubscriptionToggleBtn = /* show less */
  document.querySelector('ytd-guide-entry-renderer#collapser-item[role="button"]');
 
 var idYouTubeTopSubscriptionToggleBtn = /* prevent duplicates */
  document.getElementById("idYouTubeTopSubscriptionToggleBtn");
 
 /*********************************************************************************************
                                          MAIN FUNCTION
 *********************************************************************************************/
 function runYouTubeTopSubscriptionToggleBtn() {
  if (expandButtonYouTubeTopSubscriptionToggleBtn && 
      !idYouTubeTopSubscriptionToggleBtn) {
   /* add button */
   let clonedButton = document.createElement("button");
   let clonedTextA  = document.createElement("span");
   let clonedTextB  = document.createElement("span");
    
   /* mimic current toggle button */
   clonedButton.setAttribute("class", "title style-scope ytd-guide-entry-renderer");
   clonedButton.setAttribute("style", "background: none; border: none; cursor: pointer");
   clonedButton.setAttribute("data-toggle", "0");
   clonedButton.setAttribute("id", "idYouTubeTopSubscriptionToggleBtn");
   
   /* add text */
   clonedTextA.innerText  = "v ";
   clonedTextB.innerText = "Show More";
   clonedTextA.setAttribute("style", 
    "margin-left: 15px; font-family: monospace; " +
    "font-stretch: extra-expanded;font-weight: bold; font-size: larger;"
   );
   clonedTextB.setAttribute("style", "margin-left: 20px; font-weight: 500");
   clonedTextB.setAttribute("id", "idTextYouTubeTopSubscriptionToggleBtn");
   clonedButton.insertAdjacentElement("afterbegin", clonedTextA);
   clonedButton.insertAdjacentElement("beforeend", clonedTextB);

   /* Attach event listener to the cloned button to trigger the original button's click */
   clonedButton.addEventListener('click', () => {
    if (clonedButton.getAttribute("data-toggle") == "0") {
     expandButtonYouTubeTopSubscriptionToggleBtn.click();
     
     /* update mimic data */
     clonedButton.children[0].innerText = "^ ";
     clonedButton.children[1].innerText = "Show Less";

     /* toggle switch attribute */
     clonedButton.setAttribute("data-toggle", "1");
    } else {
     collapseButtonYouTubeTopSubscriptionToggleBtn.click();
     
     /* update mimic data */
     clonedButton.children[0].innerText = "v ";
     clonedButton.children[1].innerText = "Show More";

     /* toggle switch attribute */
     clonedButton.setAttribute("data-toggle", "0");
    }
   });

   /* find the container where you want to insert the new button */
   let subscriptions = /* HOT-GLUE - assumes index 0 */
    document.getElementsByTagName("ytd-guide-collapsible-section-entry-renderer");

   if (subscriptions[0]) {
    /* insert the cloned button as the first child of ytd-app */
    subscriptions[0].insertAdjacentElement("afterbegin", clonedButton);
    console.log('Duplicated "Show More" button added successfully!');
   } else {
    console.error('Could not find ytd-app element to insert the cloned button.');
   }
  } else {
  console.error('Original "Show More" button not found.');
  }
 }

 /* Run bookmarklet. */
 runYouTubeTopSubscriptionToggleBtn();
})();