Changes
=== Project page ===
Once a project is opened, there is a project page listing all the work sheets (e.g., Inheritance Graphs or Application Graphs) as well as all the models in the project.
You can save a currently selected project using {{key press|Ctrl}} + {{key press|S}} or the save symbol in the tool bar.
However, make sure all the worksheets are saved to the project so you don't lose any data.
This two-stage saving might seem unpractical at first, but there will be the situation where you don't want to save a worksheet to the project, so the ability to choose which worksheet to save is necessary. You can also remove worksheets and even single models from the project on the project page, by the way.
=== Worksheets ===
A project can have multiple worksheets with overlapping content (i.e., models that exist in multiple worksheets). Changing a worksheet can affect other worksheets after saving the change in order to keep consistency.
You can save a (selected) worksheet to the project using the confirm button (the icon is a hook/check symbol) in the tool bar.
After saving the worksheet, the project will be marked as changed and can be saved using {{key press|Ctrl}} + {{key press|S}} or the save symbol in the tool bar, when the project page is selected.
=== Project models ===
