You may use the [Format] button on the remote control to enlarge the teletext page.
Press the [Format] button once to enlarge the top part of the teletext page.
Press the [Format] button the second time to view the enlarged lower part of the teletext page.
Use the cursor [Up] or [Down] button to scroll through the enlarged teletext page.
Press the [Format] button again to return to normal teletext size.