ok… so you have a NavBar with Links in it.
When you change the opacity of the NavBar… it also changes the Opacity of the Links.
I only use the NavBar for Mobile devices.
For Non-Mobile… I create a Section and add links to it.
Plus… I don’t think you can change the back of the NavBar to be transparent.
So… that leans - with the NavBar - you cannot what you are trying to do.
Unless I’m missing something -----> switch to using a Section with Links instead instead.
On a Desktop… display the Fixed Position (Section) NavBar. Hide the Mobile NavBar.
On Mobile Devices… hide the Fixed Position (Section) NavBar. Show the Mobile NavBar.