mouse lock can not to be use(minecraft windows10 edition)

mouse lock can not to be use(minecraft windows10 edition)

video:I sent video to the following email(Because of our Chinese Internet)

download video cd-ctfs.ftn.qq.com/ftn_handler/3728057dbff239eefaca82cca62f5e40d3d0d8544d351b76498bbf8e21786463eee3315d709c76ffdbdc161817c0f9fb84fa2e4ccc7a602f1c610c545b2d66e4/?fname=im-angry.mp4&k=766235351d6464cc7a1ff67e1036031b02010702575406011a560105001b05015656180d0152081902540c050507070707575457363a315d5a4f545b5144481a5a1201350b&fr=00&&txf_fid=90409ef3288d24777c400d6d6a24d4da4db75267

1.This problem arises since I updated 1.10

2.I didn't stop it even change my computer