Prestashop 1.7, just plain, always visible category menu

[tasPuika]

hi,

 

we have fine working site under PS v1.6.1.24 with default-bootstrap theme

but as time flies, we think about upgrade to 1.7.x.x. I create experimental site with previous data and upgrade it with 1-Click to 1.7.6.7., upgrade went almost fine, with few complaints (like - [WARNING] SQL 1.7.5.0 1071 in ALTER TABLE `ps_customer` CHANGE `company` `company` VARCHAR(255), CHANGE `email` `email` VARCHAR(255) NOT NULL, CHANGE `passwd` `passwd` VARCHAR(255) NOT NULL: Specified key was too long; max key length is 1000 bytes)

but we lost our site design at all - there is horizontal top menu with one category, I edit and add all categories, all now looks somewhat terrible

I download "Vertical dropdown categories menu":

install it, but nothing changes or I don't know how to enable it?

 

I need "just plain, always visible category menu", like, for example, NewEgg.com, with this module, another module or default Prestashop 1.7.6.7. possibilities?

 

it may be some paid theme, module, just to resolve my needs

Edited September 7, 2020 by tasPuika (see edit history)