Adjoining Form Region in Outlook doesn't display title if display language is Right-to-Left language

1. Check and repair the language settings
Make sure the language pack is fully installed:
Open Windows Settings > Time and Language > Language and confirm that the RIG language pack is installed and is the default display language.
In Outlook: File > Options > Language, check that editing and display languages are consistent.
Reinstall the Office language pack:
Fix or re-add RIG language support through the Office installer.
2. Verify localization configuration of custom form areas
Check the ManifestXML of the form region:
Make sure the < title > or < description > fields contain multilingual resource definitions, for example:
xml
<title default="My Form">  
  <language id="en-us">My Form</language>  
  <language id="rig">My Form (RIG)</language>  
</title>
Running HTML
If the title for the RIG language is not defined, a fallback failure may result in whitespace.
Recreate the form area:
Use the Outlook Form Designer or Visual Studio to re-export the form region, ensuring that language resources are embedded.
3. Update or repair Outlook
Update Office to the latest version:
Open File > Account > Update Options > Update Now.
Verify that the latest patch has been installed (language related bugs may have been fixed).
Run Outlook in safe mode:
Press Win + R and enter outlook.exe / safe to test whether the title is displayed properly (to exclude plug-in interference).
4. Advanced Search (Developer / Administrator)
Check registry key values:
Navigate toHKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\FormRegions，Make sure there are no mandatory language coverage settings.
Track with Process Monitor:
Use ProcMon to monitor the behavior of Outlook when it loads a language resource to check for access to the wrong source file.