Navigation bar and menu

Hello,

Thank you very much for this very nice theme that I have been using for five years.
By changing the hosting server, I updated the Enigma theme (version 2.5!) To the most recent version (7.1.7). I have some questions.

First question. The site title and slogan are more central than in the old version that I used on an old version of my site (https://degaulle.lyc.ac-amiens.fr/). In addition, the top menu is narrower. I cannot change these settings. How to put the title and the slogan further to the left and enlarge the menu to use a larger page width?

Second question. The second active line of the top menu is thinner than the first, there is a space between the second active menu line and the submenus, which means that if you move the mouse too slowly, the submenu disappears . How can I solve this problem?

Third question. I liked the old version of the appearance of the submenus (arrows and white text). How can I change it in the new version of Enigma?

Fourth question. How to change the font size of the title and the text in the slider?

I apologize for the number of my questions, but my skills are limited. Thank you in advance for any help you can give me.

The page I need help with: [log in to see the link]