Some of the functions (e.g. statistics) use session cookies that enable your browser to remember your item or data selections.
How do you change cookie preferences or block cookies?
Within your browser, you can choose whether you wish to accept cookies or not. Different browsers make different controls available to you. Generally, your browser will offer you the choice to accept, refuse or delete cookies at all times, or those from providers that website owners use i.e. third party cookies, or those from specific websites. Each browser’s website should contain instructions on how you can do this.
For further information please refer to: https://www.aboutcookies.org/how-to-delete-cookies/