This is a GPU driver issue. In FL Studio, go to View > Hardware Rendering and switch it OFF . Force FL to use GDI rendering.
: This version was built for the XP era and offers the best native stability. fl studio for windows xp
For many music producers, Windows XP represents the golden era of stability and performance. Whether you are reviving a vintage "beige box" for a dedicated studio setup or simply nostalgic for the early 2000s workflow, getting FL Studio running on Windows XP is a rewarding project. Here is everything you need to know about compatibility, performance, and the best versions to use. The Compatibility Sweet Spot This is a GPU driver issue
Modern versions of FL Studio (FL Studio 21 and beyond) no longer support Windows XP. Image-Line officially dropped XP support with the release of FL Studio 12, though that version was the last to offer a bridge for older systems. : This version was built for the XP