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From Longman Dictionary of Contemporary English help yourself (to somethinga) to take some of what you want, without asking permission – used especially when offering food to someone.
A) Please help yourself to some cake.
B) informal to steal something Obviously he had been helping himself to the money;
[transitive] to spread something out, or to arrange things so you can see them easily
A display of local history material was laid out on the table.
She opened her suitcase and laid her clothes out on the bed.
Synonyms and related words
To put things together or in a particular order: prepend, sort, arrange...