To update the browser icon displayed in the browser tab for your Solo website, click Settings and scroll in the sidebar to the ‘Browser Icon’ setting. Click the ‘Upload’ button and select a square image or ico file to make your browser icon. If you upload a non-square image, it will work but it may appear compressed either horizontally or vertically as your browser icon.
Once you have uploaded your image, you can republish your website and now see the new custom browser icon in the browser tab.
Note, uploaded images to set as your browser icon have a 2mb file size limit and a 512 x 512 px limit.