Hello 89473422, welcome to Microsoft Q&A forum.
Build 26220.7653 is a new Windows Insider build, so bugs like this Settings app error are expected as Microsoft tests new features. These builds are pre-release and can have stability issues.
Since you're testing pre-release software, the best approach is to wait for the next Insider build where the bug may already be fixed. You can also consider switching to the Release Preview channel for best stability or roll back to the stable Windows release if you need reliability right now.
Also, reporting this via Feedback Hub will help Microsoft track and fix it faster.