By default, the Move Nearest Picked Key Tool lets you single-click and drag to adjust tangent handles and keys on a selected curve. You can also set the tool to enable single-click editing for all curves (regardless of whether they are selected).

To allow single-click manipulation for all curves

1. Click the Move Nearest Picked Key Tool icon ( ) to open the settings.
2. Turn off the Selected only option.

   When Selected only is on, single-click editing works on selected curves. When off, you can single-click to edit all curves.