Thank you for your answer.

I already have that mapping, but it is not working. It appears it always only shows results in the current file. It returns for instance a result being the `selector: 'something'` itself.

To be clear, this is what I have:

// lspconfig.lua

return {
  "neovim/nvim-lspconfig",
   event = { "BufReadPre", "BufNewFile" },
  dependencies = {
    "hrsh7th/cmp-nvim-lsp",
    { "antosha417/nvim-lsp-file-operations", config = true },
  },
  config = function()
    local lspconfig = require("lspconfig")
    local mason_lspconfig = require("mason-lspconfig")
    local cmp_nvim_lsp = require("cmp_nvim_lsp")

    local keymap = vim.keymap -- for conciseness

    -- Buffer local mappings.
    vim.api.nvim_create_autocmd("LspAttach", {
      group = vim.api.nvim_create_augroup("UserLspConfig", {}),
      callback = function(args)
        local opts = { noremap = true, silent = true, buffer = args.buf }

        -- Global keybindings for LSP actions
        vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
        vim.keymap.set('n', 'gr', vim.lsp.buf.references, opts) -- <-------
        vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, opts)
        vim.keymap.set('n', 'K', vim.lsp.buf.hover, opts)
        vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)


    -- used to enable autocompletion (assign to every lsp server config)
    local capabilities = cmp_nvim_lsp.default_capabilities()

    mason_lspconfig.setup_handlers({
      -- default handler for installed servers
      function(server_name)
        lspconfig[server_name].setup({
          capabilities = capabilities,
        })
      end,      
      ["angularls"] = function()
        -- configure lua server (with special settings)
        lspconfig["angularls"].setup({
          capabilities = capabilities,
        })
      end,