Navigation tab menu - rows and columns don't look the way they should

Hello,
Before I start I want to tell you, that I think your template looks really smooth.
While working on it I stumbled upon a problem:
I redid the tab navigation menu. I encountered difficulties adjusting one tab the way I want to, although I tried doing it the
exact same way as it was done in the original template in order to get
the same style.
Instead of four columns I got one column with four rows regardless.
This is how it is supposed to look like:



This is how it looks like:




Do you have any suggestions ?
Thanks in advance

Hi,you can see in quickstart package when install
if you want create 4 columns with width 4x:
- create main col with width 4x and choose has column in config
- create 4 sub cols with width x and choose has column in config
- in 4 sub cols create own menu with widh x and choose no has column

Thank you
Do I have to do a fresh install or can I change it with its current state ?

I think you should install quickstart package with Demo content

Sorry for I am a total beginner.
I installed the quickstart package as is -only thing I did was renaming menu items.
Where exactly am I supposed to create a main col and four sub cols? I don't find it.

EDIT: there are 2 more questions about articles.
There seems to be the Chicago Style used in the headlines. How can I turn that off because in German it is really unusal to capitalize every word.
Plus how can I add a bit of space around the picture of an article so that it looks better. (Both have been this way already)?



Thanks in Advance

1. If you finish install quickstart package
in admin, go to Menu > Main menu and find menu Joomla! Page
In demo,it has 3 cols so you create more col base of this, change menu item type like your

2. You can access file /templates/ot_dulcet/assets/css/template.css by ftp or in backend access Extensions/Templates, choose Templates in left menu
Choose Ot_dulcet Details and Files and access assets/css/template.css
In line 507 we have this code:
h1, h2, h3, h4, h5, h6 {
font-family: 'CartoGothicStd' !important;
font-style: normal;
font-weight: normal;
margin: 10px 0;
}
You can change font family and save it