Using Widget Framework support, [TH] Users Online Recently allows you to customize your Online Users widget through some of the following features
List Display Type:
List: Displays online users in list format, much like the default XenForo Members Online block.
Avatar Heap: Displays online user avatars, much like the 'new members' block.
Cache TTL: Defines how long the cache will live before it reloads the data
Maximum users to display: The maximum number of users that will be displayed in the block
Display Record Online: Display the record number of online users (This number may be different if you are using multiple blocks with different time periods)
Time period to display: The amount of time the block should display
Custom: Allows you to set a custom value
Today: Resets at midnight in the board's default timezone