[phossler]

I wanted to uninstall a PI

Filtered by "Installed"

Highlighted the PI

The main button was still labeled [Install]

Finally figured the right-click and did what needed to be done

1. Changing the button caption depending on the action might eliminate some confusion. If an Installed PI is selected, then [Uninstall]. If an Uninstalled PI is selected, then [Install]

2. [Customize] is disabled (dim) when an uninstalled PI is selected (good), but is always enabled if an installed PI is selected, even though Calibre knows that there is no customization available. Maybe it should always be disabled unless there are customizations available