Bug with borderless?

Whenever I open the client after I have borderless set, it changes it to windowed.

Pls.

Misc: I prefer borderless to fullscreen because when borderless is set, I can easily change windows while the game is loading to check builds, lolnexus etc. Additionally, occasionally, the game crashes when I change back to league if I have fullscreen set which really grinds my gears because then I can't even close league because the primary monitor is black and if I try to open command prompt/task manager it opens behind the black fullscreen window and I'm basically fucked and have to restart. By the time I'm back, the enemy laner is like lvl 7 and I'm lvl 1. Angery. Rant over.