tampermonkey-clean-gitlab-sidebar.user.js

// ==UserScript==
// @name         clean-gitlab-sidebar
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  only show some things in gitlab sidebar, and expand the rest
// @author       neel@rdkr.uk
// @match        https://<GITLAB_URL>/*
// ==/UserScript==

(function() {
    'use strict';

    var activate = ['repository_menu', 'ci_cd_menu', 'deployments_menu', 'packages_registries_menu']
    var hide = ['project_information_menu',
        'contributors',
        'graphs',
        'file_locks',
        'feature_flags',
        'security_compliance_menu',
        'releases',
        'monitor_menu',
        'infrastructure_menu',
        'analytics_menu',
        'snippets_menu',
        'packages_registry',
        'infrastructure_registry'
    ]

    $('.sidebar-top-level-items > li').each(function() {
        if (activate.includes($(this).attr('data-track-label'))) {
            $(this).addClass("active");
        }
    });

    $('.sidebar-top-level-items').find('li').each(function() {
        if (hide.includes($(this).attr('data-track-label'))) {
            $(this).hide();
        }
    });
})();

This script need to change its name to tampermonkey-clean-gitlab-sidebar.user.js to get noticed as a user script by Tampermonkey. Just add a .user suffix in the name of the js script is OK.

i didn't know about that - i'll update it. thanks!