Hit the Solve button to start the analysis. Once the analysis is started, it changes to the STOP button.
Hit the STOP button to stop the analysis at the end of the current iteration.
For a new analysis, the mesh is generated prior to any iterations being solved.
To generate the mesh and not run any iterations (this is sometimes useful to inspect the mesh prior to running a large analysis) right click on either the Scenario or the Mesh Size branch on the Design Study Bar, and click Generate mesh. After the mesh generates, it can be inspected by opening the Results dialog.