Try this solution if you get that error.

For some stupid reason, you may be required to write a stupid Word document by editing a stupid .dotx template. Even you are supposed to change some part of the stupid template, you may get the following stupid error:

You can't make this change because this selection is locked.

There are several proposed solution for this stupid problem but only one of them worked for me. 1

  1. If your Word is missing Developer tab at the top, first go to Options → Customize Ribbon. and enable the Developer option.

    Developer Options

  2. Then click Design Mode to remove the stupid restriction.

    Design Mode

  3. Thank LaTeX developers.

  1. The solution worked for me ↩