Turn the edge drop overlays off
The previous and next drop overlays (aka super secret drop overlay) sit slightly off the canvas. If you never use them, hide them in settings.
Starts at 1:00:02 in the full tutorialWatch on YouTube
More in Settings & preferences
See all 10Low resolution and DPI warnings59:03Keep the existing template when you remove an image52:59Keep the opposite page when removing an image53:37Match aspect ratios or preserve order (retired in 1.3.5)54:08Image placement mode (retired in 1.3.5)52:14Reset zoom and pan on template change54:42Turn template hover previews off59:35Stop blank spreads appearing at the end1:00:25Jump to a spread after dropping photos on it1:00:37