You can use the icons by typing the Unicode number and pressing Alt+X (e.g for the emoji, you need to type e76e and press Alt+X), if you receive a white box it means that the Word doesn’t know what font to use. In that case, you need to select the box and then select the font Segoe Fluent Icons.

Another option is to click on Insert > Symbols > More Symbols… On the top left, click the “Font:” dropdown menu and select “Segoe MLD2 Assets”. Double-click the symbol you want.

You can see more details at these links.

https://office-watch.com/2021/segoe-fluent-icon...

https://gzipwtf.com/how-do-you-type-the-segoe-u...

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products).

The scrollbar arrows are now drawn using specific characters pulled from the Segoe UI Symbol font. [1]

These square boxes being drawn indicate that Windows can't find the font or load it properly, or can't display the character correctly for whatever reason. People usually see this happen if the Segoe UI Symbol font became corrupted or is missing.

The solution, here, is to somehow reinstall the Segoe UI Symbol font. You can do this by finding the .ttf file for the font on an existing Windows installation and then installing it on your computer. There were places where you could download it online, but they weren't sanctioned by Microsoft and were taken down, from what I can tell. You can see if you can find it that way too, however.