If you want to lock images or objects in Google Slides, you can Group them, use Master Slide feature or use the photo as a Background.

Transform your presentation skills with Google Slides. Explore features, tips, and tricks to design stunning, professional ...

You’ll be taken back to your Google chat session. Click the blue right-pointing arrow to the right of the chat box; a panel ...

You can create a Google Slides deck in vertical orientation for smartphone users, but you'll have to use the web app to do so.