Global settings are a series of further options located across the ribbon above the main trading screens, they are enabled/disabled on each trading screen independently (so you can enable them on the ladder screen while keeping them disabled on the one-click screen).
On each of the trading screens there is a blue cog icon – when uncrossed this means global settings are enabled for that trading screen, when crossed they are disabled.
Once Global settings have been enabled it brings into effect all the options shown within the orange box of the top image.
The top left dropdown list allows you to select which options you want to use, there are a number of pre-set options and combinations available to choose from (see bottom image).
Depending on which of these options is chosen the relevant boxes to the right will then become available for you to input the values you wish to use for each.
Rather than always changing these values to suit different markets and trading styles if you have any settings which you frequently use these can be saved and added to the dropdown list making it quick and easy to switch between your favourite ones depending on the market.
Details on how to do this can be found here viewtopic.php?f=47&t=12137
To see some tutorial videos demonstrating Global settings being used on the one-click and ladder screen can be seen using the links below.
https://www.youtube.com/watch?v=ZQVq0lJxcx0
https://www.youtube.com/watch?v=oXXA3lYtWpc