Tabular Mode Limits
Tabular mode is recommended when creating simple diagrams. It has limitations when diagram complexity increases.
Object positioning (BPMN diagram)
In process diagrams, when more than 3 objects are linked to a same object, the additional objects are positioned outside the diagram. They must be repositioned manually in graphical mode.
Example: if more than 3 objects (systems used, data objects) are linked to a same operation, the additional objects are placed outside the diagram.
Reorganization of complex diagram
Diagram reorganization may take several minutes to proceed for complex diagrams.
By default, automatic reorganization is not possible for diagrams containing more than 100 sequences.

If need be, you can modify this value with the option
Maximum number of links for automatic reorganization via the Main Menu > Settings > Options > Diagrams > Display.