Describe the bug
Update 1.13.3 has enabled the chaperone for me and doesn't give me an option to disable it.
I have noticed this on update 1.13.3, but it might have changed in one of the last updates.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Settings'
2. Click on 'Play Area'
3. Open dropdown for 'Chaperone style'
4. No option to disable chaperone

Expected behavior
There should be an easy way to disable chaperone.

System Information (please complete the following information):

• Distribution: Linux Mint 19.3 (Ubuntu 18.04 based)
• SteamVR version: 1.13.3
• Steam client version: Jun 15 2020 19:59:27
• Opted into Steam client beta?: Yes
• Graphics driver version: 440.82
• Gist for SteamVR System Information: https://gist.github.com/JulianGro/e16138669ce60a40b526ce90a8ea482d

Note: Commenters who are also experiencing this issue are encouraged to include the "System Information" section in their replies.