Log in to maqetta as user 1 and create a project, save as project template and leave the share with everyone unchecked
Login in with user 2 and create a new project notice that the project template saved by user 1 is visible in the list of project templates
Log in to maqetta as user 1 and create a project, save as project template and leave the share with everyone unchecked Login in with user 2 and create a new project notice that the project template saved by user 1 is visible in the list of project templates