EA Studio comes with a set of indicators. The same indicators are used in MetaTrader. This guarantees compatibility between EA Studio's Expert Advisors and MetaTrader.
In the strategies, Indicators can be used as Entry rules and Exit rules. Therefore there are two columns in the interface (see above). The toggle button above each column allows you to enable/disable all indicators in that column at once. Of course, if you want to find strategies easily you want to enable as many indicators as you can. On the other hand, EA Studio gives you the option to select only specific indicators that will be used by the Generator and to disable specific indicators you don't want to be used for some reason.
The “Recommended” button makes the recommended indicators available for the Generator. The rest indicators are disabled. They are all stable and work well in EA Studio and MetaTrader, but have some specifics. You may enable all of them if you want.
Here are the notes of why some indicators are not recommended: