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Select the cell(s).
From the Format menu select the option FONT (Ctrl + Shift + F).
Or click on the arrow sign at the right-bottom corner of the Font option of the Home tab.
Choose the required option(s) such as Font, Font style, Size, Underline, Color, Effects under FONT tab; Style, Color under BORDER tab; Background Color under FILL tab; Horizontal, Vertical, Orientation, Text Direction under ALIGNMENT tab etc.
Click on OK.