The changes you make to your pin assignments and I/O attributes in PinEditor are temporary until you commit them.
To commit your pin assignments at any time, from the File menu, choose Commit. To run the Prelayout Checker in addition to committing your assignments, from the File menu, choose Commit and Check.
To commit your pin assignments when closing PinEditor, click Yes when prompted.
Committing your changes saves them to the “working” design for this Designer session only.
To save changes made in PinEditor to disk, you must save your design by choosing Save from the File menu in Designer.