You can right-click in front of the slide thumbnail on the first page to insert a new slide.
1. If shown, in the ppt thumbnail on the left, there is a small area in front of the first ppt thumbnail. Right-click this area with the mouse:
2. After right-clicking, select the "New Slide" button in the pop-up options:
3. At this time, a new slide will be created. Added to the front of the first slide:
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