If you can’t find the logo in the slide master, try these steps:
1. Check individual slides for logos inserted directly.
2. Examine background images for embedded logos.
3. Use the Selection Pane to locate hidden elements.
4. Look in headers and footers.
5. Check different layout options within the slide master.
If you still can’t locate it, the logo might be part of a background image that needs to be edited externally.