First, you’ll need to go into the system settings:
Click the Apple logo in the top-left corner of the screen, then click System Preferences.
Click Users & Groups.
These settings are normally locked to stop accidental changes. To make changes to these settings, click the padlock then enter your ‘Admin password’ when asked.
You can change the login settings for any user by clicking their account on the left. In the main window, click the Login items tab, which will show a list of apps with checkboxes next to them. All the apps in the list will open when you log in, but the ones with ticks are hidden, and will open in the background.
To stop an app from opening, highlight its name in the list, and click the minus sign beneath it. This’ll stop the app from opening, and your computer will load faster.
Depending on the version of macOS or OSX your Mac’s running, you might see a box which says 'are you sure you want to quit all applications and log out now?' when you shutdown or restart your computer.
If the check box under this message is ticked, the computer will reopen any apps that were active when you shut down. Uncheck the box to stop this.
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