Bookmarklet - use this bookmarklet for when toggling subscription list, and tired of scrolling way up to show less. Ensure to copy/paste the top condensed line of the bookmarklet. Info at "https://github.com/isocialPractice/bookmarklets".

siteSpecific_YouTube_TopSubscriptionToggleBtn.js

/// *********************************************************** ///
// ****************** BROWSER BOOKMARKLET GIST ***************** // 
// ************************************************************* //
//                                                               //  
// LICENSE  /////////////////////////////////////////////////////
// *******                                                       //
// The code in this gist is public domain.                       //  
// Licensed as Public Domain CC0                                 //  
//////////////////////////////////////////////////////////////////
//
// COPY / PAST BELOW LINE TO USE
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();})();

// MAKE ANY EDITS AS NEEDED
// *************************************************************
// Use the JS Formatted Bookmarklet below to see if any changes
// need to be made in accordance to the page you want to use
// it for. After making needed changes ensure that the revised
// bookmarklet is condensed before using it in your browser.
// For more info on this bookmarklet visit:
// https://github.com/isocialPractice/bookmarklets

// *************************************************************
// *************************************************************
// ************************JS-FORMATTED*************************
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();
})();