waveterm/frontend/app/element/menubutton.scss

.menubutton {
  overflow: hidden;
  .menu-anchor {
    width: 100%;
    .button {
      width: 100%;
      div {
        max-width: 100%;
        text-overflow: ellipsis;
        overflow: hidden;
        flex-shrink: 1;
      }
    }
  }
}