How to make pen size larger?

[Shit-Show-Commando]

How do i do this? i need to zoom in but the pixels keep getting smaller or any way to see how large it is on screen so you dont mess up with a tiny mouse curser? ITs a paid program the brush size display should be there somewhere
edit: find the small gear wheal at the bottom to adjust size but i still cant see how big the actual pen size is when using in