In order to open the project or file, first start the PM, search for the relevant project on the left in the directory tree and click on the project name or file with the right mouse button and a context menu will open; select the menu option Open. Alternatively, you can also use the main menu of the PM (Project / Open) instead of the context menu.
In this case, opening is in the form of activation since only projects which are open can be sensibly edited. Open files which do not belong to the project which is currently open are identified as external and should only be used for observation or for copying symbols or drawing areas.
The status of the project is indicated in the top window line in the PM. Here you can also check the name of the project currently open. After creating a project, this will be opened automatically depending on the general settings which have been configured.