size issue

guys YouTube video size is got small ,whichever video i am watching is appearing small ,i m trying to increase size by size button on crom but its not increasing 

do any other also facing same problem ?what should i do i dont know where is the problem , in crom setting or laptop

plz help guys 

i did all when i login in YouTube then only problem appear otherwise video size is normal ...as soon as i login size get short wen i sign out size get normal.

Edited by tootyfrooty- - 6 years ago