As in Samba POS 3 icons are good
when installing you sometimes get a prompt to replace or install the segoe font, you must accept that installation otherwise the font will not install that contains those icons
you will need to download again and select yes to replace Segoe font when asked towards the end of the installation process
Also, you need to run the program as an administrator only the first time
You don’t need to re-download. Just re-install (right-click run as Admin), and when prompted to install Segoe UI Symbol select Yes. Then run first time as Admin.