First we need to open the tab "Tools" and then choose "Settings". In the opened window go to "Advanced" in the left column, click "History". Next, click the "Clear" button, which is located opposite the inscription "Disk cache".
For maximum convenience in the "Advanced" window, check "empty on exit", this function will clear the browser cache every time the browser is closed.
If you use the English version of the Opera browser, you need to perform the following steps. First, select the tab "Tools" in the menu bar, then open the "Preferences" window - "Advanced". By clicking the button "Empty now" you will clear the cache.
You can also use another way. Clicking on the menu "Tools", select "Delete private data" and then "Detailed setup". In the new dialog box, check the box next to "Clear cache". Click "OK".