Tutorials are messy. They give a lot of bad information and as you start mixing them your projects also become messy as a result. SO! Just in case anyone comes across this looking for the same answer I was looking for. Which is “How to Hide HUD in main/start Menu” Check this out.
If you have your main menu setup as a level, and are using that level blueprint to load your menu BP/Widget. Make sure in the “World Settings” for the level/map the game mode is set to “none”. Then in “Project Settings” set the "Default Game Mode to “Game Mode” it is the default game mode that is in all projects.
I am leaving this here because the OP and I were asking the same question for slightly different reasons. But his post also made me realise my answer above.