Board size values "small", "medium", "large" do not describe the size - change to "7x7", "9x9", "20x15"?
As a new user to the game i don't know if it makes sense to call it board size and small medium large if what the user sees don't match that.
Small and medium is almost pixel-perfect the exact same size. Just the grid is changed.
If the window is square and you select large then large is smaller (in height) then both small and medium.
Edited by Andre Klapper