To hide 0r remove borders in Google Sheets and Docs, open the document, select the preferred table, then choose the relevant options to delete the borders.

Although there isn't a direct feature to create borders on Google Docs, there are 3 workarounds that you can use to create that appearance.

Set the Table border to 0 pt to remove the visible borders, making the table invisible and leaving only the image and caption visible.

You can add a border in a Google Docs page using a workaround, since there's no built-in border tool for doing this automatically.