It’s simple, you need to change the position of your weapon. Assign this action to the appropriate button, and everything will be fine. I also encountered this problem, but luckily someone on a forum advised me to look for the answer on vredux https://vredux.com/en/articles/switch-hands-bind-cs-2 and there I found a guide on how to quickly change weapons in your hands to open up the visible space. I understand that there are people who have learned to time their movements so that they are not visible. But after this procedure, I no longer fall for such tricks and kill them instantly. So any problem in CS can be solved either with cunning or with skill. And if you combine these tricks, the game feels completely different.