It is possible to hide your profile from certain countries based on their IP address range. Please understand that that restriction can easily be bypassed with for example VPT settings and other services. Blocking of countries can be found in the "Block Country" section of your account menu (the little avatar on the top left site brings you to the menu).
In the same menu, you can also find the "BlackList" which is to block a particular Chaser from within the platform to reach out to you.