This bug is so bad!!! The cursor size is so small and scales with the system font size!

The cursor isn't scaling correctly under high resolution. I'm using a 4K display and the integrated graphic can only support up to 2160p in game. The system scale is set to 150% as recommended. But the cursor in game sometimes is SO SMALL and make me unable to click on minions! Sometimes this problem occurs and sometimes not. It seems that increasing the system scale also changes the cursor size in game. This is so bad, why can't you just fix the in game cursor size?