The ability to automatically create a summary slide or a table of contents slide in your presentation is not available in PowerPoint 2016 for Mac. Instead, you can manually create your own summary or table of contents slide by copying slide titles onto a new slide.
First, add the slide where you want to insert a summary or table of contents. On the Home tab, click the arrow next to New Slide, and then click a slide layout that contains the type of text placeholders and layout that you want (such as Title and Content, Two Content, or Comparison).
Note: If you add a blank slide layout, you'll need to add a text box for your summary or table of contents. To do this, click Text Box on the Insert tab, and then drag to draw a large text box on your new slide.
Copy slide titles from Outline view
The fastest way to copy all of your slide titles onto one slide is to use Outline view.
On the View tab, click Outline View.
Ctrl+click or right-click in the outline thumbnails pane, point to Collapse, and then click Collapse All.
Click and drag to select all the slide titles you want to include, and then copy them (Ctrl+click or right-click, and then click Copy).
Click in the text box on your summary or outline slide, and then click Edit > Paste Special.
In the Paste Special box, select either Formatted Text (RTF) or Unformatted Text, and click OK. You may want to use Font options on the Home tab to change the appearance of your summary or contents list.
Copy slide titles manually
You can also manually copy and paste each of your slide titles onto one slide.
In the thubmnails pane, for each slide title that you want to add to the summary or table of contents, copy the title in the title placeholder, and then paste it onto the new slide in the order in which the slide appears in your presentation.
You may want to use Font options on the Home tab to change the appearance of your summary or contents list.