Showing editor changes in a presentation

When you and others are co-editing a presentation, changes by each editor are underlined in a different color. You can choose whether to show or hide the underlines

• Your own editing underlines are hidden for you by default. To show the underlines, click your profile picture in the sidebar. Your underline color is displayed under your picture and your underlines appear in the presentation.
  Note: You cannot change which color is assigned to you because colors are assigned automatically.
• The editing underlines by other editors are shown by default. You can hover over an editor's underlines to display his or her initials at the end of the passage. To hide one person's underlines, click the profile picture of the co-editor whose underlines you want to hide. The underlined color is no longer displayed under that co-editor's profile picture and underlines of that color do not appear in the presentation.
  Note: You can click View > Co-editing highlights to hide highlights for all editors.