The author has been on the search for a library to create GUIs in C++ with specific requirements like Windows support, commercial use permission, and easy styling. WinUI 3 offers modern Windows components, but unpackaged app support is lacking. Qt is complex but offers easy styling with Style Sheets, while wxWidgets is lightweight and supports dark mode. Hikogui uses Vulkan but has a steep learning curve. Sciter is a good Electron alternative, but has rendering issues. Dear ImGui is recommended for simple apps due to its small size and lack of dependencies. Overall, finding the right C++ GUI library comes with challenges and trade-offs.
https://tulach.cc/writing-gui-apps-for-windows-is-painful/