Hello @Jack3
The recommended solution is to create a new STM32CubeIDE workspace, because this is the safest and most effective way to remove corrupted UI or metadata state without touching the actual project files.
Go to File → Switch Workspace ,select a new empty workspace from this menu, restart STM32CubeIDE in that fresh workspace, and then re-import the existing project.
THX
Ghofrane
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