How can I assign the same setting to ALL of my forms without editing each one

Another question, How can I assign the same setting to ALL of my forms without editing each one by personal? 

I would like my forms to have the same color or the same table design(with same rows and lines), I am finding my self editing each form for a lot of time just for those small editing choices.

Unfortunately this is not possible at this time. 

You can only edit the design of each of the form individually using the Form Builder and Form Designer.

An alternative you can do is to create a template form first.

Then use the cloning method to duplicate the form each time you create a new form. The cloned form version will have the design/styles of the original form template.

Guide : How to Clone an Existing Form from Your Account

Let us know if you need further assistance.