Hi there,
Hope you are doing well.
Recently, I have come across a situation where I have installed an MS office update and somehow it corrupted the BizTalk Orchestration Designer. BizTalk Orchestration Designer was not getting displayed in the list of editors as shown below.
When I have opened the BizTalk project file in the XML format, it was showing as below.
<ItemGroup>
<XLang Include="ProcessOrder.odx">
<TypeName>ProcessOrder</TypeName>
<Namespace>MyProjectNamespace</Namespace>
<SubType>Task</SubType>
</XLang>
</ItemGroup>
For most of the people out there the <SubType>Designer</SubType> section is shown and once removed it worked as expected but in my case, I don't have <SubType>Designer</SubType> in the project file.
To solve the problem, I have closed all the opened visual studio instances and ran the below command in the Developer Command prompt for Visual studio and I could see the BizTalk Orchestration designer as shown below. Run the Developer Command prompt for Visual Studio as an administrator.
devenv.exe /ResetSettings
Hope it has solved your problem.
Have a great day.
