You can change the font, size and style of text using the Font command under the Text menu. This presents the standard Font Dialog.
There are three controls in this dialog, along with a Sample window that shows the selected typeface.
Font
This shows a list of all True Type fonts in the system. If none is highlighted, the range of text or shapes selected has more than one font. Leaving this list un-selected will result in no change to the font.
Size
This shows a list of sizes for the selected font. If the size you want is not listed you may enter it in the size field. If no size is highlighted, the range of text or shapes selected has more than one size. Leaving this list un-highlighted will result in no change to the size.
Style
This shows a list of styles (or weights) for the selected font. If no style is highlighted, the range of text or shapes selected has more than one style. Leaving this list un-highlighted will result in no change to the style.
Applying the Change
Selecting a new font from the Font Dialog changes the typeface for any of the characters that are currently selected in your drawing. Selected text is shown in reverse color as in other Windows programs. If no characters are selected, the next character you type will be in the new typeface.
When one or more shapes containing text, rather than the text itself, are selected, applying a change using the Font Dialog changes all the text inside the selected shapes. You can change the typeface of all the text in a drawing by using the Select All command, followed by the Font command.
The typeface applied using the Font Dialog becomes the new starting typeface for text entered into empty shapes, or as background text.