A family of Microsoft word processing software products for creating web, email, and print documents.
If you are using the command Picture>Wrap Text>Left Square Bracket, you are using Word for the web, which is a limited version that runs in a web browser. If your Microsoft 365 version is Basic, then that's all you can use.
If your version is a Personal or Family plan, then you're entitled to download and install the desktop software, which is much more capable.