If you want to share your whiteboard outside your organization, you can export your entire whiteboard as an image file. Those who view it will not be able to edit it. This is also a good option if you have a personal Microsoft account and want to share your whiteboard without letting others make changes to it.
With your whiteboard open, click the gear icon at the upper right. On the menu that opens, click Export image. On the next panel, select Standard resolution or High resolution, then click Export. A screenshot of your entire whiteboard will be created in PNG format and saved to your PC or mobile device.