Editing Entity dimensions

How to edit the dimensions of the entities?

Depends on the entity. Be specific about what you are trying to do.

Hi DaveR, thanks for your reply.
I´m a very beginner. In fact I have draw a line and then I would like to change it lenght. How to edit it?

See:

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In ‘Entity Info’ replace the length for a new value.
A stand alone edge will enlarge at the end (not the beginning) of the existing edge.
An edge that is connected to other geometry at just one side will enlarge on the free side.
An edge that is connected on both sides can’t be changed through ‘Entity Info’.
But there are other ways like using the ‘Move’ tool.