After adding items to Interactions and Processors in the Input Action UI window, more properties can be edited for each item by selecting them. However, whenever the item is edited, it loses focus in the window, and the configuration area disappears, which makes editing them very difficult.

Repro:
1. Download package and project at: https://github.com/Unity-Technologies/InputSystem
2. Open Input Action asset at: Assets -> Demo -> SimpleDemo -> SimpleControls.inputaction
3. In the UI window, select PrimaryAction under "fire" in the middle section
4. In the right section, select "Tap" under the Interactions
5. Try to change the "duration" value to 0.5

Actual: The items in Interactions and Processors lose focus when editing their properties.