change the number of results that appear on each screen (the default option is 50, but you can change this to 10 or 25 results per page)
addasu nifer y canlyniadau sy’n ymddangos fesul sgrin (50 canlyniad fesul sgrin yw'r dewis diofyn, ond gallwch addasu hyn i 10 neu 25 o ganlyniadau fesul sgrin)