Hi Piotr / Ceść Piotr

TO set up multilanguage site you have to do many adjustments Its not only adding language and language switcher You have to "translate " all content and assign them language atribute Good explanation step by step is here https://www.joomshaper.com/documentation/helix-framework/helix3/how-to-create-a-multilingual-site

I used it for my site and its works perfect

Yes I know, I tried to go through the process, but the problem appears in the first step and I cannot help it.

I have polish installed: https://prnt.sc/26ull7f

but then it doesn't appear here: https://prnt.sc/26ullu7

https://prnt.sc/26ulmhg

I'm out of ideas what is happening

Piotr

For you its needed only Site languages (Języki treści) Other ones are for backend When you will finish all steps from link which I sent yo, new language will appear on site

On your first screen you have Joomla languages - its not your site languages On second scree you have site languages but polish is not visible bacause you did not finish all required steps You hace to cerate manus in PL, copy o template for PL aticles aith lanyage atribute PL and so on Nezt you have to assign language codes to menu items by choosing PL copy of template and so on

You have everythink in link which I sent you Do it and PL will appear

First install language packs for Joomla - this is what you lack and block you in next steps

You can find it here https://downloads.joomla.org/pl/language-packs

Chłopaki, przecież procedura wielojezyczności jest od tylu lat taka sama. Tyle książek, postów, filmów, polskie forum joomla, grupy na FB ....

@Piotr, po zainstalowaniu spolszczenia - trzeba utworzyć język polski również tutaj klikając Utwórz >> https://prnt.sc/26ullu7

Later yes, follow our JoomShaper tips: https://www.joomshaper.com/documentation/helix-framework/helix-ultimate-2/multilingual-site

Or find tutorials on youtube.

Zgadza się ;) True ;)