Track Properties
Be aware that some of the following settings (such as Constant Velocity) are not available for a Doodle track.
Use this setting to turn animation tracks off, i.e., the track will not be animated despite existing animation. This state will automatically be inherited by the Child objects (Child objects’ states can nevertheless be switched independently of the Parent objects). The same functionality can be found in the layer column in the form of an Film Strip icon that can be turned on or off.
Activate this setting if you want to switch the track to Solo Animation mode, i.e., only that track will be animated and all others will be turned off. This state will be inherited by all Child objects but can be changed on an individual basis. The same functionality can be found in the layer column in the form of a film strip that can be turned on or off.
See Set/Reset Constant Velocity.
Drag the name of a previously created Time Curve here.
If enabled, the Time Track’s temporal position or length will no longer play a role. It will basically be adapted to the corresponding animation track (as if it were identical).
If this option is enabled the colors defined in the Preferences menu ( track X/Y/Z color) for the F-Curves will be used in both 
Dope Sheet and 
F-Curve Mode. If this option is disabled, the color can be defined freely (for most Tracks).