These pages cover SQL Compare 14, which is not the latest version. Help for other versions is also available.
Using SQL Compare projects
Published 21 August 2019
With the SQL Server Management Studio add-in, you can launch SQL Compare projects from SQL Server Management Studio.
Launching a project from SQL Server Management Studio
In SQL Server Management Studio Object Explorer, right-click a database you want to compare in the project you want to launch.
Under Saved Comparison Projects, click the project file you want to launch: