Change Extensions preferences on Mac
You can also select extensions to include in the Share menu, and select widgets for Today view in Notification Center.
To change these preferences, choose Apple menu > System Preferences, then click Extensions.
Extensions you installed on your Mac. These are extensions created by third-party developers.
If the extension is a content extension that enables extra functionality in apps, you see an Actions checkbox below the extension. If it’s a Finder extension, you see a Finder checkbox. Select the checkbox to enable the extension.
Content extensions installed on your Mac. Select a content extension to make it available in apps.
For example, if Markup is selected, you can draw on pictures and sign documents in apps such as Mail, TextEdit, or Preview.
Photos extensions installed on your Mac, such as Markup. Select a Photos extension to make it available in Photos while editing photos.
Quick Look extensions installed on your Mac, such as Markup.
Select the sharing extensions to include in the Share menu (available from the Share button in the Finder and in many Mac apps).
Select widgets, such as Now Playing, to include in Today view in Notification Center.
You can also show or hide widgets directly in Today view.
Select extensions that you want to access from the Quick Actions shortcut menu on the desktop, and in the Finder and the Finder Preview pane. See Perform quick actions in the Finder.
If your Mac has a Touch Bar, select extensions that you want to access from it, if you set options for the Touch Bar to show Quick Actions or added the Quick Actions button to the Touch Bar.
You can use the Automator app to create Quick Actions workflows that you can enable as extensions and access in the Finder, the Touch Bar, or the Services menu. See Create a workflow in Automator on Mac.