Quick Toggles
The DM toolbar has some extra icons below it. These are quick toggles that are useful for a variety of things.

Fake Player
When this is enabled the DM’s screen will be rendered as if they are in fake player mode (See Fake Player)
Line of Sight
This quick toggle only shows up if you have Line of Sight enabled.
It allows you to disable LoS only on your own screen. Just like the Fake Player toggle, this helps with verifying light & vision setups during prep work. It will show green when LOS is enabled and red when it’s (temporarily) disabled.
In particular when working on a new location where you likely have no shapes with vision access ready you can use this to verify lights you setup without having to create temporary shapes.
Initiative
The initiative quick toggle is compared to the other toggles more than a convenience. When enabled it will turn green (until clicked again) and indicates that initiative is active.
It will automatically open the initiative UI for all players and will activate some of the Initiative settings. These settings are only active when initiative is explicitly enabled using this toggle!