This article will show you how to modify the startup method for an Add-On that has already been installed.
First log in to your Extension Manager
https://LOCALHOST:40000/ExtensionManager/ or https://SERVERNAME:40000/ExtensionManager/ example https://onprem:40000/ExtensionManager/
Select the Company Assignment Tab
Select the Company you need to make the change on
Press Edit in the Settings column on the Extension you need to modify
Select Startup Mode on the left.
From here you can change the default mode for all users along the top and or you can change each user individually in the User Preferences Table.
You can change each individual user to:
Default: Uses the Default Startup Mode selected at the top
Automatic: Overrides Default making the extension launch during the log in process
Manual: Overrides Default making the user manually start the Extension when needed
Disable: Overrides Default making it so the user cannot start the Extension at all
Once you have made the desired changes, simply close the Extension Assignment Settings window. Changes will be applied at the next log in for the user.