ScandiPWA supports the favicon change from the Magento admin panel.
On the Admin sidebar, go to Content > Design > Configuration
Find the store view that you want to configure and click Edit in the Action column.
Expand the HTML Head section
To upload a new favicon, click Upload and choose the file from your computer.
5. When complete, click Save Configuration.
6. On the Admin sidebar, go to System > Tools > Cache Management
7. Choose Flush Cache Storage.