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Hover your mouse cursor over the icon you want to remove.Icons linked to system controls can be easily removed from the menu bar in the following way: How to Remove System Icons From the Menu Bar Note that the Notifications icon in macOS is designed to sit in the far right corner of the menu bar and cannot be moved elsewhere. Other icons will step aside to make space for it. Holding down the left mouse button, drag the icon into your preferred position on the menu bar.Hover your mouse cursor over the icon you want to move.Fortunately, re-organizing them is simple, once you know how to do it. But left to their own devices, the arrangement of said icons is likely to become haphazard. Plenty of menu bar icons offer useful shortcuts to app and system functions, and may take up permanent residence on your screen. If the corner of your Mac's screen is fast becoming an eyesore, here are some quick and simple actions you can perform to bring order to the chaos, plus a few additional tips for making the most of Apple's menu bar extras. With SIP off, you should be able to delete whatever you want, so you'll probably want to turn it back on as soon as you're done dumping Font Book.The macOS menu bar is a great place for quickly accessing system and application functions using menu extras or "menulets", but it can get cluttered pretty quickly as more and more icons vie for a space there. Here's a quick article describing the Terminal commands to turn off SIP in Sierra without booting into Recovery. (That should give you an indication of how strongly this is discouraged!) However, Apple did make that a tiny bit easier in Sierra by no longer requiring a boot into your Recovery partition to make the change.
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You can disable SIP, but it can be pretty dangerous. Starting with El Capitan, Apple introduced System Integrity Protection. However, if you take a look at threads of folks removing Font Book, you'll see all on the older side. Apple has some info on Font Book in their Mac Basics documentation. It handles all the fonts on your computer, including the one you're using to read this website. You can't delete it because it handles important functions that make your computer work. That means it's part of the operating system. Just like the warning says, Font Book is a system app.
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