Tools
Drawings
Open the drawing panel to toggle the drawing mode, in this mode: you can draw shapes that will be visible to all players. You can also enable player drawing if you wish.
Ruler
Click on the Ruler tool or hold R to toggle the Ruler, you can then click-and-drag your cursor onto the board to calculate distances.
The distance per grid cell and units can be set in the Grid's parameters.
Ping
Pings are useful to bring attention to a specific part of the Board and communicate easily. Hold the P key and click on the Board to ping an area.