Hi,
residual plot can reopened from Solution > Reports > Residual > Plot.
Regarding other plots it depends. You can replot all the graphics you have created as objects ( contour pathlines,you can find them inside the tree under Results > Graphics and Results > Plots tabs.
Report plots ( how the variable change with iteration ) is not usually saved when you close and reopen. So in this case I suggest you to save the values into a file .out.
You are navigating away from the AIS Discovery experience