Use the setting in the log out or restart dialog

When you log out of your Mac or restart it, deselect ”Reopen windows when logging back in” when prompted.

Sep 09, 2020 Mail is likely the default email app on your Mac, but just in case you have others downloaded, you can set the default reader. Here's how: Launch Mail from your dock or the Finder. Click Mail in the menu bar at the top of the screen. Click Preferences. Click the dropdown next to Default Mail Reader. Click the app you'd like to set as the default. Open certain files in a specific apps on Mac. Step 1: right click on the file. Step 2: hold down the ⌥ (alt/option) key and you will see the Open With dialogue change to Always Open With. Step 3: select Always Open With and click the app that you wish to permanently assign this file to.

Or start up in safe mode, then restart normally. This doesn't change the setting, but your Mac forgets any windows that were open the last time you logged out or restarted.

If you deselect this setting and an app continues to open automatically:

• The app might be a login item. You can add or remove login items in Users & Groups preferences.
• The app might have installed its own startup software. Often this is controlled by a setting within the app. Check the app's preferences or documentation, or contact the app's developer.

Use the setting in General preferences

To prevent apps from remembering the windows they had open, choose Apple menu  > System Preferences, click General, then select ”Close windows when quitting an app.”

Or press and hold the Shift key while opening an app. This doesn't change the setting, but the app forgets any windows that were open the last time you quit the app.

If these steps don't work for an app, the app might have its own setting for reopening windows. Check the app's preferences or documentation, or contact the app's developer.

How To Always Open Unverified Apps On Mac Os

Every now and then I stumble across some more or less cool application I install on my Mac. Some of them were built by authors not verified by Apple. Whenever this happens you see a box popping up telling you that you can’t run that app. You can go to the security / Gatekeeper pref pane and allow for this app for this time to run but the option just to allow all unverified apps to start is gone since 10.11 I suppose.

How To Always Open Unverified Apps On Mac Windows 10

Since Apple very seldom removes a functionality from a new release there is a way to switch to allowing those apps from the command line. I found a solution on the german Mac site MacGadget:

How To Always Open Unverified Apps On Mac Computer

This works just like to old option setting. HTH.