how to prevent bootstrap navbar split into few lines when collapsed

I've been searching for it all day and couldn't find a solution, so I hope I won't look like an idiot when in 2 minutes someone will post an answered link for the exact question.

I am trying to create a navbar like on steamdb Where the search box remains after the navbar collapse and is just reduced in size.

But I ran into the problem where if I set the navbar to <nav class="navbar-expand-lg" </nav> then when it collapses it split into 3 lines, one for the brand, one for search, and one for toggle dropdown.

If I remove the "-lg" then it doesn't split, but then it also doesn't change the items to toggle.

<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <div class="container">
      <a class="navbar-brand" href="/">My Company Name</a>
      <form class="d-flex w-100 d-inline-block">
        <div class="input-group">
          <input class="form-control no-border" type="text" placeholder="search for game..." id="example-search-input">
            <span class="input-group-append">
              <button class="btn rounded-pill" type="button">
              <i class="bi bi-search"></i>
              </button>
            </span>
        </div>
      </form>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
        aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>

      <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav ms-auto mb-2 mb-lg-0">
          <li class="nav-item">
            <a class="nav-link active" aria-current="page" href="/">Home</a>
          </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown"
              aria-expanded="false">
              content
            </a>
            <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
              <li><a class="dropdown-item" href="/test1">test1</a></li>
              <li><a class="dropdown-item" href="/test2">test2</a></li>
              <li><a class="dropdown-item" href="/test3">test3</a></li>
            </ul>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Donate</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>

https://www.codeply.com/p/uaWJpGVRED

Please help, I've been stuck on this all day