I can not put the mega menu in columns

It's certainly possible that the menu is using both - if the plugin is applying colors but doesn't go as deep, the GP colors will probably take over.

Hello Tom
Ak final I followed your advice and I bought the license of Uber Menu, I have two problems, I think the menu of Generate press interferes in the menu of uber menu, attached image if it is fixed leave two arrows in the main menu when only An arrow appears.
http://www98.zippyshare.com/v/hEot0Oh9/file.html
Thank you

Hello again tom

I also have the problem that above the menu appears another bar, attached image
http://www43.zippyshare.com/v/O8rBWaBf/file.html

Thank you

Hi Jordi,

There are some tweaks we have to make to GP to work with UberMenu.

This should help: https://generatepress.com/forums/topic/ubermenu-problem-integration/#post-173772

Hello Tom,

Thanks for the answer, it worked, the plugin is very good, I have a problem with the size of the fonts that you as well know the plugin maybe you can help me, I already sent a ticket to Ubermenu but the answer is not fast, it turns out I've changed the font size of the first level but I can not figure out how to resize the submenu fonts, do you know how to do it?
Attached image (http://www99.zippyshare.com/v/UhR47Muj/file.html)
thanks for your help

Hard to tell, but perhaps it's inheriting the value from GeneratePress in "Customize > Typography > Primary Navigation"?

Fixed, thanks

You're welcome :)