I just installed Maya 2018 since my hard drive had to be wiped. And when I'm trying to adjust my key frame in the graph Editor, I realized I cant adjust the length of the selected keys. Usually the adjustment icon would be squares beside the key but mine are triangles. All my other controllers can be adjusted except for this one. Is the a way to disable or enable me to adjust my key frame? I've looked through other ways for solution but they all don't give the answer I want.