This Navigation Bar Transparency problem began when Apple made Dark Mode. I told them about it and Apple fixed it but they have broken the Nav Bar again in iOS 15.

From Apple to me re: Feedback reply Mar 18, 2021 at 4:57 PM – FB9047661: Xcode Simulator Accessibility Spoken Content Problems Xcode & crackling speaker output while simulators are open on Macs running Big Sur: Apple: After reviewing your feedback, we have some additional information for you, or some additional information, or action is necessary for this issue: Please verify this issue with Xcode 13 Beta 5 and update your bug report with your results by logging into https://feedbackassistant.apple.com/ or by using the Feedback Assistant app. Xcode 13 Beta 5 (13A5212g) https://developer.apple.com/download/ Posted Date: Aug 10th, 2021 For a complete list of logging instructions visit: https://developer.apple.com/bug-reporting/profiles-and-logs/ My reply to Apple: Sorry, I do NOT run Beta Softwares on my machines anymore. I will let you know how the final Gold Master release works.

Mar 18, 2021 at 7:29 PM ORIGINATOR Update to this problem: Besides the speaker corruptions mentioned above after installing Big Sur, It has actually expanded and Warped the top and bottom of the case, likely from overheating the internal battery, which may have lead to the speaker issue as well. The Mac no longer sits flat on a desk top but now rocks on the bottom of the case and the top screen of the machine no longer completely closes either due to the deformation of the case after installing Big Sur! I am very upset about all this. Today I called Apple to have them send me a box to send in the machine to repair it for me. I have already had to prepay $640 for that job and estimate to fix machine C02R90KQG8WQ. The fan is running loudly and the edges of the screen are separating from the heat. I believe that all of this relates to installing Big Sur onto the Mac.