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Hello. I have a fresh installation o prestashop 1.7.5.2  and I am using the default theme CLASSIC.
I would like the subcategories of the MAIN MENU  to appear  NOT horizontally (by default)  but instead VERTICALLY.

In the first image, you can see my current situation.

The second image is what I am trying to achieve.

I searched everything in the back office and especially in modules but I was not able to find anything about subcategories appearing vertically. Yes, you can add or remove categories in the main menu module but not to change the style.
I do not want to install any extra modules for something that simple.
Is it possible to make the drop down menu appear vertically? Even by editing CSS files or specific template files in the server?
I found the file: /themes/classic/assets/css/theme.css  but I am not sure what to edit there...

Thank you in advance for all your answers

Hello. I have a fresh installation o prestashop 1.7.5.2  and I am using the default theme.
I would like the subcategories of the MAIN MENU  to appear  NOT horizontally (by default)  but instead VERTICALLY.

In the first image, you can see my current situation.

The second image is what I am trying to achieve.

I searched everything in the back office and especially in modules but I was not able to find anything about subcategories appearing vertically. Yes, you can add or remove categories in the main menu module but not to change the style.
I do not want to install any extra modules for something that simple.
Is it possible to make the drop down menu appear vertically? Even by editing CSS files or template files in the server?|

Thank you in advance for all your answers

Hello. I have a fresh installation o prestashop 1.7.5.2  and I am using the default theme.
I would like the subcategories of the MAIN MENU  to appear  NOT horizontally (by default)  but instead VERTICALLY.

In the first image, you can see my current situation.

The second image is what I am trying to achieve.

I search everything in the back office and especially in modules but I was not able to find anything about subcategories appearing vertically.
I do not want to install any extra modules for something that simple.
Is it possible to make the drop down menu appear vertically? Even by editing CSS files or template files in the server?|

Thank you in advance for all your answers