Thank you for your question and I am very sorry about the experience!
Unfortunately, as of now, the slab's outline showing in the story below can only be controlled globally via the Legacy Preferences
. There is an existing wish in our Wish List database (please refer to it as #7700), I have updated it with your comment. Hopefully, our Product Management team will adopt this one in the near future!
Thank you very much for your understanding! Have a great day!
Technical Support Engineer