Best Of
LINQPad.QueryPlanVisualizer for LINQPad6 with SQL Server and PostgreSQL support released
I just released an update for LINQPad.QueryPlanVisualizer so the visualizer is now compatible with LINQPad 6. It supports LINQ-to-SQL and Entity Framework Core and the new version adds support for PostgreSQL too.
You can also Share plan to https://www.brentozar.com/pastetheplan/ or https://explain.dalibo.com/
For technical details, you can read my blog post at Updating LINQPad.QueryPlanVisualizer for LINQPad6 And Entity Framework Core
Feedback is appreciated.

Re: Detect if running inside linqpad or lprun
#if CMD "cmd".Dump(); #else "ide".Dump(); #endif

Re: Wish LINQPAD Support VS Split Windows
I'll make the grab-bar bigger and more iconic in the next build

Re: MissingMethodException when trying to print a string in F#
You need the reference assemblies for the runtime that you're using (.NET 3.1 or .NET 5). If you have the SDK installed, they are located in %programfiles%\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0\ref\net5.0. If you don't have the SDK, you can download them from the Microsoft.NETCore.App.Ref NuGet package. I don't know whether fsc.exe has an option to help you with this.
Your other option is to use dotnet build - I believe this is the recommended solution outside Visual Studio and LINQPad.

Re: Wish LINQPAD Support VS Split Windows
There's no keyboard shortcut, but you can split the windows by dragging the space above the vertical scrollbar.

Re: Wish LINQPAD Support VS Split Windows
LINQPad does support split windows. What specific problem are you having?

Re: LINQPad support for .NET 6.0 Preview 1?
Experimental support for the .NET 6 preview is now available in the latest beta:
https://www.linqpad.net/linqpad6.aspx#beta
Let me know how you get along.

Re: Windows 10 on ARM Support?
The blocking issue is WPF, which is Intel-only right now. Once WPF is made to work for ARM, LINQPad should run. Hopefully this will happen later this year, before .NET 6:
https://github.com/dotnet/wpf/issues/1817

Re: Roadmap for cross platform (ubuntu/linux)?
First, @JoeAlbahari thank you very much. Im extremely happy, glad and excited because so far it seems to work very very well. 😍😍😍😍😍😍😍😍😍😍
As you are for sure aware, being able to run LinqPad on linux/macOS is one of the top features, so it might be a good idea to document this, and give full support using this modality (Wine/Crossover)
True, it seems the activation isn't working very well @dstjacques and it is kinda glitchy.
Also exporting to HTML seems to work, it exports the contents correctly but it crashes afterward.
THANK YOU VERY MUCH @JoeAlbahari I'M SURE THE WHOLE COMMUNITY IS GOING TO SHARE THE SAME EXCITEMENT ONCE THEY KNOW OUR FAVORITE TOOL IS AVAILABLE FOR MACOS AND LINUX

Re: PostgreSQL with EF Core 5?
This is supported from version 6.12, which has been in beta for a few weeks, and is RTM today.
