All Files Enabling the Flat Toolbar Delete this text and replace it with your own content. How to use enable the Flat Tool Toolbar preference From the top menu, select Edit > Preferences (Windows/Linux) or Harmony Premium > Preferences (macOS). In the Preferences dialog box, select the General tab. Select the Flat Tool Toolbar option. Click OK. Save your work and close Harmony. Restart Harmony. The Tools toolbar no longer contains nested tools.