Youtube short automatically gives 10 video every time when clicking one youtube short video. This script just remove the 9 video we didnt ask and the navigation down button. On file can only deal with AJAX, and the other only when restarting

youtube-shorts-remove-recommendation-on-restart.js

// ==UserScript==
// @name         Remove Yt Shorts Recommendation on restart
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  The other script not fast enough to observe the fast query on restart so do this instead
// @author       FadhilAF
// @match        https://www.youtube.com/shorts/*
// @icon         https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Youtube_shorts_icon.svg/193px-Youtube_shorts_icon.svg.png
// @grant        none
// @run-at        document-idle
// ==/UserScript==

(function() {
    'use strict';

    var attempt = 0
    //just running this every 250 ms
    function check() {
        attempt++
        //check if they already got 10th video
        if(document.getElementById('9')){
            const ytShorts = document.getElementById('shorts-inner-container')

            //remove the rest 9 video
            for (let i = 1; i < 10; i++) {
                ytShorts.removeChild(document.getElementById(i.toString()))
            }

            //navigate down button element
            let downButton = document.getElementById('navigation-button-down')
            //removeing the navigate down button element
            downButton.parentElement.removeChild(downButton)


        } else {
            if (attempt >10) {
                alert('failed getting the ninth element')
            } else {
                setTimeout(()=>{check()}, 250)
            }
        }
    }

    check()
})();

youtube-shorts-remove-recommendation.js

// ==UserScript==
// @name         Remove Yt Shorts Recomendation
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Delete auto suggestion youtube short (2-10th video) and navigation down button
// @author       FadhilAF
// @match        https://www.youtube.com/*
// @icon         https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Youtube_shorts_icon.svg/193px-Youtube_shorts_icon.svg.png
// @grant        none
// @run-at        document-idle
// ==/UserScript==

(function() {
    'use strict';

    //ytShorts container observer
    const ytShortsObserver = new MutationObserver(records=>{setTimeout(()=>{
        //yt-shorts container
        const ytShorts = document.getElementById('shorts-inner-container')

        records.map((record)=>{

            if(record.addedNodes[1].id!=="0"){//idk how this addedNodes object present node data, but the object at the 1 index of the list provide the youtube shorts video id

                ytShorts.removeChild(ytShorts.children[1])//remove the second yt-shorts video (meaning the recommended video, and the next recommended video on the next index is moving 1 index up)
            }
        })

        //navigate down button element
        let downButton = document.getElementById('navigation-button-down')
        //removeing the navigate down button element
        downButton.parentElement.removeChild(downButton)
    },0)//youtube will be confused if we do it immediately
    })

    //page manager element on youtube to control whether its showing feed or youtube short (if you haven't opened a youtube shorts video from the first time you open/refresh youtube.com, yt-shorts container not yet added)
    var ytPageManager = document.getElementById('page-manager')
    //observer to observe when youtube shorts container added
    const pageManagerObserver = new MutationObserver(records=>{
        records.map((record)=>{
            if(record.addedNodes.length != 0) {//if the children of this element added, then youtube shorts container already added

                //yt shorts container element
                const ytShorts = document.getElementById('shorts-inner-container')
                ytShortsObserver.observe(ytShorts, { childList: true })

                pageManagerObserver.disconnect()
            }
        })
    })

    //check if there already a youtube short container or not
    if (document.getElementById('shorts-inner-container')) {
        //yt shorts inner container element
        const ytShorts = document.getElementById('shorts-inner-container')

        ytShortsObserver.observe(ytShorts, { childList: true })
    } else {
        //if not then observe the yt page manager
        pageManagerObserver.observe(ytPageManager, {childList: true})
    }

})();