there seems to be an issue with Qt dialogs on BigSur with the current Qt version used on the main Felgo build. We are currently investigating the issue further. You can also try installing Felgo 3.7.0 built with Qt 5.15.1 from the Qt Marketplace, this should fix the issue: https://marketplace.qt.io/products/felgo
just to understand your situation, are you now able to deliver a fix for your customers based on 5.15.1 or are you blocked?
In the later case, please send us an email with details about the issues that you face with 5.15.1, and what fixes in 5.15.2 you would expect to improve your situation. We can then discuss how we can help you best.
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