In my proyect I only show in sandbox layout of one of my tables, I have 3 tables, and I have two layouts in front and backend by each table, but in sandbox I only see layouts believe of one of this table,in front and backend.

Images of trhe problem

Can you explain better please ?

Do you mean you cannot access a layout ?
Which layout is the problem ?

I deleted the tables, I created again, I created layouts again and works perfectly, I have only one problem, in the layouts the foreing key fields does not appear as Combo, appear as text field.
I made another proyect and built perfect, but this proyect I have this problems.

This is the Backends URL www.j-cook.pro/sandbox/cms25/administrat...yout=asistenciasitem

Yes, because maybe you have instancied the field without opening the field node.

In the builder, in the fields tree, first open the FK node.
Then drag the sub node containing the text you want to show in the combo.
(First, you must remove the wrong field from the form)

Hope it helps.

Ok, Thaks, one milion gratefully

You are welcome.
Cheers.