Layouts library initialization mode:

• "full" - all Layout functionalities are available;
• "fullWaitSnapshot" - same as the "full" mode, except that the Layouts library will notify that it is ready a little later - when a snapshot of the available Layouts has been received;
• "slim" - Layout events aren't tracked and Layouts can't be manipulated;

• "full"
• "fullWaitSnapshot"
• "slim"