- if want mod eos or default i3 config . Your Mod the config in home … NOT one in /etc
Thank you all very much! I feel really stupid right now, but thank to you all again, now I understand the difference between /etc/i3/config and local i3 config.
So, the problem was that, because of my ignorance I copied and replaced default config file with config file from /etc/i3/config.
Correct 
Edit actually no… You replaced your user i3 config with the default located in /etc/i3/config. That’s why you see the basic i3 wm user interface.
But I linked the exact part in the wiki that explains that in my post above…
No problem at all. You are new to this, so it is normal to run into a few problems. The i3 developers have truly done a superb job in documenting their software. i3’s user manual has pretty much all the details you need to know to configure and customize your i3 experience.
i3 is awesome, btw!
Here you go. The user guide is very detailed.
https://i3wm.org/docs/userguide.html
Is the place for original EndeavourOS setup files… we use /etc/skel package to setup users setup on users creation… so to reset to EndeavourOS defaults you will need to copy from /etc/skel folder or take latest files from the GitHub repo… there are instructions to create the setup manually too…