IDEA installs Activiti BPMN visualizer
Click on File -> Settings -> Plugins
Search for activiti BPMN visualizer and install Install
Click File -> New, and if you see New Activiti 6.x BPMN 2.0 file, the installation is successful
Create the activiti file
Right-click the xxx.bpmn20.xml file you created, click View BPMN (Activiti) Diagram, and a visual editing window will pop up