It is possible to open the Custom SQL editing window even if EnableCustomSql is not enabled
Answers approved by DevExpress Support
We have addressed the issue described in this ticket and will include a fix in our next maintenance update. Should you need to apply our fix prior to official release, you can request a hotfix here.
Important Notes:
- Hotfixes may be unavailable for Early Access/Beta builds or updates set for release within a week.
- .NET only: in the NuGet Package Manager, use your personal NuGet feed and check the "Include prerelease" option to view the hotfix package in the "Updates" tab.