Fences could use many improvements. This is what I would like to see.

The ability to dock Fences to the sides of the screen.

The ability to use tabs on Fences docked at the screen edge so multiple Fences of the same opened size can be stacked and accessed.

The ability to allow Fences to always appear on top of other windows when activated from a screen edge.

Fences should gain focus for scrolling without having to click on the Fence or desktop.

In detail view mode, Fences should remember which header details are enabled and disabled as well as remember the lengths of each header detail section.