Create a gap in Grid canvas (bezel)
In Grid type, use X and Y areas to create gaps between outputs.
Note :
In Grid type, gaps are equal for all outputs of the same row / column.
Preconfig > Canvas⚓
Select a Screen with Grid canvas type.
Select the X or Y area where the gap will be created.
In Configuration, select Gap and enter the size in pixels.
The canvas is updated with the corresponding values.