This is HTML editors so you have to insert hard spaces using (without spaces): & n b s p ;
Enter one for each space you want to insert, five for the traditional tab. You will need one to get two-spaces after a period as well.
Thank you for your answer but again I don't quite see what to do. The link you provided says that I should type but, as I already said, this appears literally as this sequence of characters. The general link refers to entering non-breaking spaces in other applications such as Word or Powerpoint but these solutions (e.g. holding Control-Shift or holding ALT and typing 0160) don't work in MaxBulk.
This works! But using spaces does not align properly the columns, as you can see in the attached screenshot. So, I guess, I need to use the tabs. Which takes me to the previous problem of the sequence of characters appearing in the text as they are typed.