Remove 3rd row with day of week from Windows 10 taskbar

To remove the Day of the Week from the date section of the taskbar, simply right-click on the taskbar and go to Taskbar Settings. Turn off Use Small Taskbar Buttons. Right-click again on the taskbar and untick Lock the Taskbar on the menu. Go back to the taskbar and adjust the width to hide the Day of the Week. You may Lock the Taskbar again to keep the desired settings.

To get a 2-line date/time field:

Right-click on the taskbar and make sure "Lock the taskbar" is not checked.

Resize the taskbar to a single line of icons (smaller).

To get a 1-line date/time field:

Right-click on the taskbar and click "Takbar settings".

Set "Use small taskbar buttons" to "On".

When the taskbar is a double-row of icons it allows for 3 rows of data in the date/time field. Setting this to a single row of icons allows for a 2 row date/time field. Setting the icons to small sets the date/time field to a single row.