There are many ways to filter the roster section to focus on the type of player you wish/need to add to fill out your roster.
You can click on the tab for a specific position to see only this type of player.
You can filter the list by available games or salary per game by using the available slide bars above the player list.
You can also search by name. Or for those tricky last names, if you know the team they play for, you can filter to see players from a specific team.
The same filter options are available on mobile. To use the filter, tap the Filter icon in the bottom left corner of the player list.