If you want to reduce the size of the Clocks palette you can hide its close button, resize control, and scroll arrows.
On macOS 13 or later, choose World Clock Deluxe > Settings. On macOS 12 or earlier, choose World Clock Deluxe > Preferences. Click Palette and select the "Hide controls" checkbox.
Control-click the palette's background and choose Hide Controls from the shortcut menu.
Shift-click the palette's background.
After you have hidden controls you can close, resize, and scroll the Clocks palette using a shortcut menu.
To close the palette, Control-click its background and choose Close from the shortcut menu.
To resize the palette, Control-click its background and choose a number of clocks (1 Clock, 2 Clocks, ... , All Clocks) from the Resize To submenu of the shortcut menu.
To scroll clocks, Control-click the palette's background and choose Scroll Left and Scroll Right or, if the palette is vertical, Scroll Up and Scroll Down from the shortcut menu.