Preferences: UI Settings

Confirm when deleting torrents displays a dialog asking for confirmation when you try to delete a torrent job from the torrent jobs list.
Confirm when deleting trackers displays a dialog asking for confirmation when you try to delete a tracker from the Trackers list.
Show confirmation dialog on exit displays a dialog asking for confirmation when you try to exit µTorrent.
Alternate list background color will make µTorrent alternate the background color for each item in a list-view (be it the torrent jobs list, or one of the list-views in the detailed info pane) between the default list-view background color and the column highlight color. If disabled, µTorrent will simply display the default list-view background behind every item in the list-view.
Show current speed in the title bar displays the total upload and download rates in the title bar of the main window, before "µTorrent".
Show speed limits in the status bar displays the global rate limit (if set) next to its corresponding value in the status bar.
Use fine grained file proprieties displays 16 priority levels in the files tab instead of the regular three (normal/high/low).
Confirm exit if critical seeder displays a confirmation dialogue when you try to exit and you are a critical-only seeder

Close button closes uT to tray will tell µTorrent to close the main window to system tray rather than exit when the close button is used in the window title bar.
Minimize button minimizes uT to tray will tell µTorrent to minimize the main window to system tray rather than the taskbar.
Always show tray icon will display the tray icon regardless of µTorrent's main window visibility (unless hidden with the boss-key). If disabled, µTorrent will only display the tray icon when it is closed or minimized to system tray.
Single click on tray icon to open will make it so that it takes a single left-click on the tray icon to display or hide the main window. If left unchecked, it would require a double-click to achieve the same result.
Show balloon notifications in tray will display a bubble tooltip notification in the system tray when certain events occur in µTorrent, such as the download completion of a torrent job, an error, and so on.
Always activate when clicked will make it so that left-clicking (or double-clicking, depending on whether the single click tray icon option is enabled or disabled) the tray icon will only activate the main window. If left disabled, µTorrent would normally alternate between activating and hiding the window for the same action.

Don't start the download automatically adds manually imported torrent jobs in stopped mode. If this option is enabled, "Start torrent" in the Add New Torrent dialog will be unchecked by default (but can still be enabled). If that dialog is not enabled, torrent jobs will simply be added in stopped mode, and will have to be started manually.
Activate the program window will open the µTorrent main window (if hidden, minimized to system tray, or minimized to taskbar). If unchecked, µTorrent will simply display the Add New Torrent dialog.
Show a window that displays the files inside the torrent will tell µTorrent to display the Add New Torrent dialog. If unchecked, µTorrent will simply ask where you'd like to save the torrent contents, assuming a default download location is not set.

For seeding torrents allows you to select the action that µTorrent takes when you double-click a seeding torrent job on the torrent jobs list.
For downloading torrents allows you to select the action that µTorrent takes when you double-click a downloading torrent job on the torrent jobs list.