Welcome to TalkGraphics Greg

NavBars need to be ungrouped for editing then recreated.

Double click on the navbar, then click the Ungroup to Edit Graphics button in the lower left of the dialog.

Delete all but one button. Arrange > Remove Soft Group. This leaves two groups on two different layers.

Edit each button. Then Arrange > Apply Soft Group.

In the Website Properties menu select Create Navigation Bar.

Recreate your navbar.