This is a trick I used for years to easily find how to code anything by searching through the engine source. The trick is to use tooltips. Everything in the editor has tooltips and they can be used to find the entry point of any editor action. Find the tooltip and you'll find the logic.
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FLevelEditorModule: https://docs.unrealengine.com/5.2/en-...
ULevelScriptBlueprint: https://docs.unrealengine.com/5.2/en-...
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Unreal Engine Version ► 5.2
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0:00 Intro
1:02 Unreal Installation Setup
1:45 Visual Studio Solution Overview
2:35 Unreal Project Overview
3:10 Find how to trigger a Play In Editor
9:28 Code out Play In Editor
20:27 Find how to open a Level Blueprint
23:55 Code our function to open a Level Blueprint
29:15 Outro
29:53 Patreon Wall!
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UE5 C++ 0.1 - How To Find Anything In Engine Source? - Unreal Engine Tutorial Editor CPP