Atom 1.30: Adapt tree view and editor font size for large monitors (like the 27" ones). NOTE: This overrides the built-in editor text zoom feature (Cmd + / Cmd - / Cmd 0).

styles.less

// Adapt tree view and editor font size for large monitors (like the 27" ones).
@media (min-width: 1800px) {
  // Root font size
  body {
    font-size: 18px;
  }
  
  // Editor font size is specified separately
  atom-workspace {
    // NOTE: This overrides the built-in editor text zoom feature (Cmd + / Cmd - / Cmd 0).
    --editor-font-size: 18px;
    // NOTE: Ideally, `--editor-line-height: 28px`, but the editor lines are grouped and positioned without accounting for this variable with `transform: translateY(126px);`.
    --editor-line-height: 21px;
  }
  
  // Linter icons don't scale well with root font-size
  .linter-status-count a {
    padding: 3px 6px;
  }
  .linter-status-count a::before {
    margin-right: 6px;
    width: 16px;
    height: 16px;
    font-size: 16px;
  }
}