action map UI has zero tooltips

[laurentlavigne]

what is T?

who knows

[system]

@laurentlavigne

who knows

Those, who bother reading the manual.
https://docs.unity3d.com/Packages/com.unity.inputsystem@1.6/manual/ActionAssets.html#editing-bindings

Finally, you can choose to manually edit the Binding path, instead of using the Control picker. To do that, select the T button next to the Control path popup. This changes the popup to a text field, where you can enter any Binding string. This also allows you to use wildcard () characters in your Bindings. For example, you can use a Binding path such as /touch/press to bind to any finger being pressed on the touchscreen, instead of manually binding to /touch0/press, /touch1/press and so on.

[laurentlavigne]

Those, who bother reading the manual.
Input Action Assets | Input System | 1.6.3

not the point.