So that your window resists attempts to break it open: Secure the hinge sides as well.
The window hinge side security device FAS97 offers a good solution here. This window safety device can be retrofitted to most wooden and plastic windows. To tilt the window, the window lock is unlocked manually. When closing the window, the additional lock is always automatically engaged. So you never forget to lock the additional window lock.
The extra slim window hinge side lock ABUS FAS 101 is a very inconspicuous security device. This lock for the hinge side is tested according to the regulations of VdS and offers around one ton of pressure resistance.