Libraries from packages not recognized in IDE

I have the esp8266 package installed. This comes with many libraries, such as "ESP8266WiFi". However, these libraries are not detected by the IDE and don't show up for example when I go to Sketch>Include Library. I've searched online but all the tutorials I found say it should work how I have it set up, but it doesn't. Thanks in advance to anyone with an answer!

Have you got an ESP8266 board selected?

Alright, this is incredibly embarrassing, yep that worked. Thanks!