

Recovery Mode is a special partition on your Mac you can use to restore from a backup, reinstall macOS, get online support, or erase your startup disk. It's not usually possible to erase the startup disk because your Mac is using it to run macOS.To delete a user account from the Mac device, select the correct user name in the left pane and then click the “-” (minus) button below “Login Options.”. Once again, click the lock icon in the bottom-left corner of this window, type your user account password, and click the blue “Unlock” button.To delete a user account from the Mac device, select the correct user name in the left pane and then click the "-" (minus) button below "Login Options.". Once again, click the lock icon in the bottom-left corner of this window, type your user account password, and click the blue "Unlock" button.

You should back up your Mac before trying to erase or reformat it. Next, go to the Search tab and pick the search engine. Type the preferred website in the Homepage field. Hunt for an extension associated with Search Marquis, select it, and press Uninstall.
