If you want to open the main menu, you can do it by the following steps:

Reopen the software, click User Defined in the toolbar, and then select the tree option. The tree menu on the left of Midas gen20 14 disappears, and it cannot be called even if you click the toolbar. The main reason is that midas parameters have changed and the software needs to be restarted. midas gen will automatically reinitialize the parameters, and then select the toolbar to call the tree on the left.