you’d have to just increase your browser zoom or system zoom, which would make everything bigger.
under the hood, the pins are visualized and delivered separately from the areas that you have to click. sometimes, there’s a lag between the the pins being displayed on that map and the clickable areas becoming available. also, the clickable areas are approximations of the shapes of the pins. so not every pixel of the pin and the corresponding clickable area will line up exactly.
i guess what i’m saying is that your inability to click on the pins may not necessarily be due to their small size. you may just have to move the mouse around the general area of the pin image a bit before you land on the right spot to click.