How do I unsubscribe from all symbols?

You can unsubscribe from all symbols by right clicking anywhere in the Symbol List Window until a dropdown appears with the option to Unsubscribe from all symbols. Once you click this, all symbols except the ones you have an open position in will be removed from the Advanced Dealing Rates and Simple Dealing Rates tabs.

This is an image of the symbols list right click menu, which allows users to Unsubscribe from all symbols at once