Like many gaming apps, Steam starts automatically when you log on to your computer. This can cause bandwidth clogging, as games update automatically or appear online when you don’t want them to. Automatically starting Steam is easy to deactivate quickly.
In Windows, click Steam> Settings to open the settings screen. On Mac, click Steam> Preferences to open the preferences screen.
Once in the Settings or Preferences menu, click on the “Interface” tab on the left side of the new window.
Next, find the “Run Steam when my computer starts” box and uncheck it.
When you have changed the setting as desired, click “OK” to close this menu and confirm the setting.
If you’re playing on Windows 10, you can choose to disable startup programs through Windows Task Manager. You can prevent certain programs from launching at startup on a Mac by opening System Preferences> Users and Groups> Connection Elements and unchecking the desired programs.