Several objects from another level appearing in a level that they shouldn't?

Question

I created a project in Unreal, Top Down Character.

By default, the scene looks like this:

I thought of creating a main menu to take the player to the other scenes of the project I intend to do. For that I created an empty level.

See below:

• I created the "Level_Menu", "BP_Menu_Widget" and "BP_Menu_ADM".
• Notice that in the hierarchy I just added the "BP_Menu_ADM".

At first, visually, everything looks normal. I just created a text with the name of the project:

The problem is when I look at the hierarchy:

A huge amount of objects appear. Objects that I have no idea why they appear. I imagine it has something to do with the fact that the project is initially a default project (top down) from Unreal itself.

An important detail is that the project is not purely blueprint, I created it exactly like this:

Before coming here (as usual), I tried to research something like this, even in English (which is not the language I speak). But I didn't find anything related (I probably don't know how to use the right terms).

I changed the gamemode, I set everything to "none", I got to the point of opening a script called "world.h", but when I went to play with it to see what happened, Visual Studio warned that it was a read-only file.

Then I finally recognized that I needed help. I would like someone to help me understand what is happening and how to solve it, without necessarily creating a project from scratch. I will only use this option as a last resort.

Answer 1

I researched further and found the answer on the Unreal forum.

Link of question (question and answer from 'saldavonschwartz'):

https://forums.unrealengine.com/t/how-to-create-a-truly-blank-empty-project/377987/2

In short, Unreal by default will always create some objects that have to be present in every scene.

To solve the problem, just create a new 'Game Mode Base':

Go to the 'World Settings' window:

Change the 'GameMode Overrides' option (by default it will be 'none'), selecting the game mode you created:

Even so, when you press play, several objects will be created (they are necessary and mandatory, in the link I sent above, it explains a little about). But the project's default player will not be.