Use disposable cleaning history, if you want to clear the history for one session. The same effect will enable incognito mode for one session, or a temporary disabling history storage. To change this setting through the dialog of basic settings Opera tab in the advanced settings, the menu item "History". This will leave all the links in the magazine that existed before the beginning of the session browser with disabled saving of visited pages.
Activate full off save the list of visited pages, if you want to completely disable logging in the browser. Open the settings dialog box of the browser via main menu button or pressing Ctrl+F12. Switch to the tab with the list of advanced settings and select left menu item "History". First press the "Clear" button to remove already existing entries in the history log, then remove the tick from the "Remember content on visited pages" to the cache with information about the visited locations has been removed, and set the parameter value to "Remember addresses" to zero, selecting the desired option. Then, apply the settings by pressing the OK button.
Use the sidebar and a menu with quick access to the settings, if the button with the main menu available. The icon with the log open the context menu, select "Keep history", click the sub-item "0". The effect is the same, only not removed the existing record and not cleared the cache with the loaded pages from the magazine. This method is suitable for the case when you just want to disable the storing of history, without destroying the previously stored list of visited pages.