If you have saved the settings of a former Calibration Assistant session, you can load them again by the menu item File ▹ Load Assistant Settings or via the corresponding button of the tool bar.
You can save the current settings of a Calibration Assistant session using the menu item File ▹ Save Current Assistant Settings or the corresponding button in the tool bar. Then, you can load them again in a later session.
When closing the Calibration Assistant dialog with the menu item File ▹ Close Dialog, the current settings are stored for the duration of the current HDevelop session. That is, as long as you do not exit HDevelop, you can again open the Calibration Assistant with the same settings. In contrast to this, when you exit the Calibration Assistant, the settings are lost also for the current HDevelop session.
When you exit the Calibration Assistant with the menu item File ▹ Exit Assistant, the assistant's dialog is closed and the current settings are lost unless you have stored them using the menu item File ▹ Save Current Assistant Settings. If you want to close the dialog but keep its settings for the current HDevelop session, you should use the menu item Close Dialog instead.