The y-axis minimum and y-axis maximum can be set in the Tile Configuration (right-click on tile -> Configure Tile).
Multiple signals can be placed within a single line graph view tile using the Signal Keys section.
The line graph view will draw x and y axis gridlines when sized larger than the default size.
The timestamp and values of each signal at a specific point in time can be seen on hover.
The color of each data stream can be selected by clicking on the associated color icon to the right of the Signal Key name field.