How to set same background in multiple page design
Method 1: Right-click on the background > Select "Copy" > Paste it onto a new slide.
Method 2: Use the Copy & Paste shortcut. Click on the background in the artboard to see a blue border around it. Then press [Ctrl+C] and [Ctrl+V] on a new slide.
How to set same gridlines across multiple pages
Create gridlines > Click [Copy Page] OR Use shortcut [Ctrl + D]
