How to add "Icon Function":
1, first click the file option in the upper left corner of PPT.
2. Then click the "Options" icon in the lower left corner of the file opening interface.
3. Click Customize Ribbon and select All Tabs in the options window that opens.
4. Then find "Illustration" in "Insert" option, click "Insert icon" and select "Add".
5. After adding it to the Insert tab, click OK and return to the home page. You can see that there is an icon in the Insert.