I would like to suggest the following.
 Disable Bing:
There is already StartPage, DuckDuckGo and Qwant enabled. So including Bing would be over-doing. In fact, Bing results hardly come up in Disroot Search. Disabling Bing would free-up respective resource and time consumption, that can be used for any other engines.
 Enable Library Genesis:
LG is one-of-a-kind for literary resources. So it will be beneficial.