@Satoshi Nakamoto Thanks for reaching out and Apology for the inconvenience due to this issue. As per the screenshot it looks like the Preview Designer.
Can you please navigate to logic app code view and then again click on logic app designer view, and you should see the Generally Available Designer. Please click on it and the designer should be back to the previous one. Please update the properties if needed and test it to confirm if you still observe the same issue.
Once confirmed that the issue is resolved I will also suggest you to leverage the File a bug option in the new designer so the product team can review it and fixed it. The issue might be caused due to the new designer and the product team is improving it as per the customer feedback and reported issue.
In case if the general designer doesn't help you then please let me know so I can assist you further.
Update: I will reach out to the team for the issue in preview designer.
As James and Satoshi suggest you can us the fallback link to revert back to the old designer: https://aka.ms/lafallback
In case someone observe any issue with the new designer feel free to create the bug in this GitHub repo : https://github.com/Azure/LogicAppsUX/