I'm having a problem with workplace configuration - it appears as a 4x1 box when I do Ctrl+Alt+→. I have 2x2 box at the other installation (was that way since the start), so how can I make it this way instead of 4x1?
First you need to install compizconfig-settings-manager. The quickest way is from the terminal. Open a terminal (CNRT + ALT +T) and type:
Open the newly installed compizconfig-settings-manager and under "General Options" set the desktop size to 2 horizontal and 2 vertical, it should look like this:
Note that you should be careful with compizconfig-settings-manager you can break your system if you do not know what you are doing!
Looking at your other question, it seems that you are using Unity 2D. There is no way to reconfigure the workspace layout seen when switching workspaces with the keyboard shortcuts.
While it is unlikely that they will add such a configuration option, the current 4x1 presentation is considered a bug and future versions should show the expected 2x2 layout:
You can temporarily change the layout for the current login session with the following command though: