A favicon is the small icon browsers show in the tab and in bookmarks. Set one and it appears for every one of your maps.
Upload your favicon
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Open Team Settings
Sign in, open the menu (top-right), choose Team Settings, then expand Favicon.
Only team admins can change this.
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Choose an image
Click Choose file and pick your icon. Accepted formats: .ico, .fav, .png, .jpg, .webp or .gif. A preview appears once it uploads.
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Done — or remove it
That's it; the icon applies across your maps. To clear it and go back to the default, click Remove.
A simple, square logo mark works best — favicons are tiny, so fine detail gets lost.