For example, you can:
A) Set the listing type that you want. For example - choose items that you can buy now or bid for in an auction. Highlighted in blue in the image above.
B) Set the minimum and maximum price that you are willing to pay, in USD or ETH. Highlighted in green in the image above.
C) Set whether you want to see all items, single items, or bundled items. And sort by price, newest, oldest and so forth. Highlighted in pink in the image above.
D) You can also choose to see listings only in certain currencies (you will need to scroll down the filter list on the left to see this option). Shown in the image below.