how to "select all" in "Select Stock" page

When Click "Backtest" tab on the home menu and entering "Select you Stock" , you can see a pop up windows for list of sectors you can choose such as:

Clear all

When I click "+" to open one of the category such as "US sector ETF" , do I have to select one by one ?

Is there "Select all" Feature so that I can just uncheck unwanted item or select all in this category?

thanks:)