The text box has no border or fill color by default. To give the text box a border, click the “Border Color” option, which is the pen icon, and then select a color from the drop-down menu.

Whether you want to make text stand out, add some structure, or create a unique visual, we’ll show you a few ways to insert a text box in Google Docs.

Double-click the border of the text box to select the text box as an object. This action also shows format commands that apply to a graphic object instead of text.

If you want to add a Text Box in Google Docs then you can use the Drawing option & Single cell table, & change font, border width, background color, etc.